I know the date I concieved but my due date doesnt work out?

Question

I definately concieved on the 6 th August (13 days after the start of my period) and the ONLY day I had sex as my hubby works away

I went for my scan and they say my due date is the 5 May doesnt work out, anyone else had this

the first answer is wrong I only had sex THAT day in the entire month!!!

2nd answer the dates of my periods ARE accurate just not the scan ok!

it seems doctors DO NOT go on the day off your last period they do it on measuring your scan, only people who know a little please!

Answer 1

This happened to me with my first pregnancy. I gave the doctor my dates and he was happy to go with them until I had my first scan and after measuring baby he told me that the dates I gave him must be wrong, so instead of my due date being the 15th of December it jumped hugely to the 29th January.

I knew my dates were right because it was just after my birthday in March that I conceived.
The Doctors told me all the way through my pregnancy that I was wrong, but I proved them wrong when my waters broke early hours on the 16 December unfortunately baby didn't make an appearance until the 21 December but he was a good weight and no way 5wks early even the midwife said so.

So Trust your gut instinct and keep a note of your dates you are more than likely right, always remember no one knows your body better than you do!

Answer 2

Sometimes it takes several days from the time of ejaculation to the time of conception. It could take several days for the sperm to reach the egg and fertalize, and then several more for the egg to become implanted into the uterus.

If they came up with the due date through Ultrasound, then this is usually pretty accurate, but not always exact. It most likly is the best estimated date based on the size of your baby. It is possible that maybe your baby is slightly bigger or smaller than usual for the date you concieved. This really doesn't mean anything except that all babies are different than each other, including yours. This just means that the averages they use to compute your due date may be a bit off from the rate of growth your baby is going through.

Unless your due date is way off from whatyou were expecting, then there is nothing to worry about. It only means that the baby will be born when it is ready, which is what is going to happen no mater what the doctors say.

Answer 3

due dates are calculated from the first day of your last menstrual period so if your due date is 5 of may then your last period was around 29 july (40 weeks) give or take a few days. So from the info you have given the scan seems ok.

Estimating the due date from your scan is the most accurate way of determining your due date. All my children's due dates were determined by scan and they ALL were on time which is very rare! But I wouldnt worry about the exact date as most babies do not arrive on their due date it is normal for a baby to be born two weeks either side of this date.

Answer 4

It doesn't always matter if you go by the actual date of having sex because although you may have had sex that day, it may take a day or two for the sperm to reach the egg and become fertilized. This is why due dates are approximate and usually go by the first day of your last period. I am actually due in January and only know the date of conception and not the date of my last period because due to nursing my older baby I was not getting it regularly. I'm sure my two dates would not match up either. Expect to deliver your baby anytime at the end of April to the middle of May, since a "normal" pregnancy is considered to be between 38 and 42 weeks.

Answer 5

these days, they count pregnancies as 40 weeks, technically meaning you are prego for 10 months. plus, i've never heard of a doctor who DIDNT count a due date based on date of last period at first. have you TOLD THEM the only day you could have possibly conceived? It may help them re-calculate, or at least explain to you HOW they come up with that date.

oh, and the person above me has a point. sperm can live in your body up to five days. so if you werent ovulating on the day you had sex, you may have ovulated in the few following days and gotten prego then. that can throw off your due date from what you think it should be too

the general rule of thumb is that your due date can be off give or take 2 weeks. its not an exact science i know its hard, but stop fixating on the mundane facts. what really matters is that you relax, and have a healthy pregnancy. congrats, and spend your time worrying about your health and the babies, not a date that will never be totally accurate anyway.

Answer 6

So your last period was around 7/24, which by dates would make you due on May 1. By the scan, the docs have come up with may 5.

You may have only had sex on August 6th, but you may not have actually conceived on that day. Could have been up to two days later, and then it takes a while for implantation to occur. So assuming the embryo implanted around the 8th or 9th, then May 5th is actually pretty close.

Answer 7

don't worry they have done this to me also!!
by my dates I'm due 7Th of may and Ive just been for my scan and they have added 10 days to the due date but this doesn't add up as my partner also works away from home and if i conceived when they say i did then he wasn't even there at the conception lol, but i know he was and i know the weekend we conceived our child. but a scan can get it wrong as they only estimate due to the size of the baby and its not 100% fool proof but neither is going on the dates from your last period as sperm can live up to 5days in the female body and the egg only lasts a few hours plus it all depends on how long your cycle is and when you ovulate. i know everyone says its 14 days after the first day of your period but that's not true you can ovulate at any time during your cycle. that's why some women can become pregnant during their periods. everyone is different and since i have a 5 week cycle its possible that i ovulate later than whats considered as average. so by going on my own due date and the scan date I'm due anywhere in the month of may but then it all depends on when the baby wants to turn up. but for everyones question to whens the baby due? i say sometime in may. good luck and relax and put your feet up and just enjoy being pregnant as you will soon be holding your new baby. congrats and take it easy i hope this helped to put your mind as ease!!!

Answer 8

like you I know exactly which day I conceived but the 13 week scan should the my due date out by almost two weeks. By the time I had my 20 week scan the due date had reverted back to what it should have been. So don't worry, you know best for now, your next scan should be more accurate. If worried perhaps you can ask for a scan in a few weeks.

Answer 9

I had this happen to me also. I'm currently 17 weeks 1 day pregnant according to my ultrasound due April 13th, but according to my LMP I should be due April 4th. I know the day of my conception(due to my fiance and I working different shifts and not seeing each other I know the day because we were both off), but it doesn't work out right either, according to it it should be the end of March. I'm going by what the ultrasound says because that is what the doctor is choosing to go by. Also, due date are just estimates so there is not an specific date that you will deliver. Sperm can live inside your uterus for 2-5 days so you could become pregnant after you had sex. I would just be happy that I was pregnant and not worry about it that much. You know when you conceived and so does your husband so you should just be excited that you are expecting. Congratulations!

Answer 10

Well..the sperm can live in the uterus and fallopian tubes for up to five days. You could have had sex lets say on a monday and ovulated on a friday. That would have been the day you conceived your baby, not the day you had sex. If you had sex then you ovulated on the same day, perhaps your baby is just growing faster or the scan was incorrect. Did they measure the baby's legs or did they measure the CRL (crown to rump length)? Usually, the earlier test (CRL) is more accurate during the first couple of months only. The leg measurements are less accurate. No worries..they call it medical "practice" for a reason!!