Hpts vs Blood test?

Question

I am about 12 days late, but only had sex sep 13-17, so in my case i think it is too early to test. I have tested at least every third day and all negative. I went to the dr to do blood test and she said it was too early, but my question is how many negative test did you take till the positive result?

They told me when i went in i have to wait at least 30 days from the time of intercourse because it would have happened right before i was supposed to start.

Answer 1

A blood test will show you are pregnant 7 days after conception and is 100% accurate...

This below came from the website http://www.peeonastick.com

How soon can I test? Well, first you gotta know how the test works. Briefly: the home pregnancy test (HPT) works by detecting a hormone called human chorionic gonadotropin (hCG.) When an egg is fertilized, it takes about 6 to 12 days to implant in the uterus, and then it begins to secrete hCG. It takes another day or two for enough hCG to build up and make its way into your pee. So, generally speaking, the earliest you can expect a positive HPT is 8 days past ovulation ("DPO") and the latest would be about 16 DPO. It is possible to get a positive test earlier or later, but not as common. In my experience, if you use a sensitive "early" test (anything that detects 25 mIU/mL of hCG or less) you can test around 12-14 DPO and feel reasonably secure with your results (the later you test, the more secure you can feel in its accuracy.)

If you do not chart or monitor your fertility in any way, and you think you may have conceived, you should wait 19 days (or longer) after having sex to test. Why 19?! Sperm can live approximately 5 days in the proper environment; if the sperm managed to live until you popped an egg, the actual conception could have taken place several days after the sex act that got the sperm there. To make sure you're not testing too early, assume the sperm had very long lives (5 days is considered a very long sperm life) and that conception occurred then. Then allow 14 days for the embryo to implant and develop enough hCG to show up on a pregnancy test (96% of pregnant women will test positive by then.)

Note: some HPT's say "test 5 days before your period is due!" or some such thing. Please note they are assuming a textbook 28-day cycle, with ovulation on Day 14. "5 days before your period is due" thus really "translates" to 10 DPO.

Essentially, you should remember that your high school biology textbook was WRONG. NOT all women have 28-day cycles and NOT all women ovulate on Day 14. For more info on this type of thing, see the Fertility Info section.

Here's an example. This is the textbook-perfect 28-day cycle with ovulation occurring on day 14 (in pink.) 10 DPO and later are reasonable days for testing (in green.) This is the cycle the HPT companies have in mind when they say "test 5 days before your period is due!"



Well, not everyone's body works this way. Here's another 28-day cycle-- but this one has ovulation occurring a little bit later, still well within the normal range. Watch what happens to your (green) testing opportunities!



All of a sudden, "5 days before your period is due!" is way too early for you to expect a positive test! (I tend to ovulate later myself, so by the time the "gold standard" of testing at 14 DPO is applicable, my period is already 3 days late! I needed to use an "early detection" test on the first day of my missed period. A "regular" test would probably have been negative-- even though my daughter is living proof that I was, indeed, pregnant ;)

Of course, it works in reverse, too. If you're an early ovulator, you're lucky! Check it out:



In this scenario, you could test even sooner than 5 days before your expected period.

Ultimately, it's important to remember that implantation is a variable thing. You may be able to detect a pregnancy very early on, but then again, you may not! If you can't, don't despair.

Answer 2

I'm not sure what you mean. If you are 12 days late from when you expected your period, you should be able to take an hpt. Also if you had sex Sep 13-17, if you got pregnant then it should be time for an hpt to be accurate.

Me, the one time I was pregnant I took the hpt the day my period was due, and the next day, and the next day. Showed pregnant every time but I didn't "believe" it until I got the blood test! (By the way, unfortunately every time I've had a negative hpt it was truly negative for a reason.)

Good luck, my fingers are crossed for you!

Answer 3

If you ae 12 days late than you should be able to have a blood test to find out if you are pregnant! I was 5 days late and got one, and it was positive. If you have all these negative tests, then it probably means that you are not pregnant. I can nor say for sure as I am not a dr., but that dr. lied. Please, get it checked and good luck!

Answer 4

Blood exams are extra correct. Pee exams can also be diluted via the volume of drinks you drink, so they aren't constantly that correct. plus a few men and women, such as you stated, have HCG phases too low in the beginning to exhibit up at the experiment. I might move to the medical institution closest to you and notice approximately getting a blood experiment performed, if you're greater than 7 days past due on your interval you must move to a medical professional in any case to ensure the whole lot is fine. GL!