How soon after an egg is fertilised does it make hcg levels rise?

Question

I purchased an early pregnancy test which detects levels of 10 mIU/mL (most pregnancy tests are over 50 mIU/mL) and is commonly used in hospitals. I was wondering at what point does a fertilised egg make hcg levels rise, as this test says it is more sensitive and can be used BEFORE my period is due. I just want to know when as i want to take a test as early as possible!!

Answer 1

A blood test is 100% accurate and will show you are pregnant 6 days after conception.

hCG Level Information
Human Chorionic Ganadotropin (hCG) is only produced during pregnancy. It is the hormone that home pregnancy tests look for as well as blood tests at the doctor. It is produced when the fertilized egg implants in the uterus.

An hCG blood test at the doctor can detect a pregnancy between 8 and 10 days after fertilization. Any level over 5 is considered "pregnant." Keep in mind, however, that the normal miscarriage rate is very high at this point, still over 30%. Home pregnancy tests typically require 14 days, when your period would normally be due. The level for these tests ranges between 50 and 80. By this point, the normal miscarriage rate is down to 10% since the baby is clearly well implanted and churning out proper hormones.

The rate of hCG should usually double every 2-3 days. Keep in mind that if you have been given hCG shots as fertility treatment, it will throw off your reading and could even give you a false positive.

The numbers in the chart below are only a guideline, and are so broad as to be almost useless. They are here to give you a small measure of reassurance, although the only true way to know if your hCG level is rising appropriately is to take two tests about three days apart. The reason for the large range in the chart is to assume you may be as much as 7 days off on your ovulation, and to allow for larger numbers for pregnancies with more than one baby. In my own experience and with those women who have shared their numbers on the bulletin board, if you are rock-sure of your ovulation date, your number tends to be about 2/3 of the highest number for your week.


Week since last menstrual period began
Amount of hCG
in mIU/ml

3
5 - 50 (less than 5 means you are not pregnant)

4
5 - 426

5
19 - 7,340

6
1,080 - 56,500

7-8
7,650 - 229,000

9-12*
25,700 - 288,000


*You will likely see the hCG rates go DOWN after the first trimester, when it is no longer a factor in pregnancy or miscarriage because the placenta has taken over. At 9 weeks, however, your baby will be monitored by ultrasound rather than hCG levels.

Slow-rising hCG. Unfortunately, even if your levels are rising, the failure to double every few days is not a good sign. This type of pregnancy can go on for several weeks, but will almost always end in miscarriage. A single set of tests that do not show a doubling can still be fine. Usually another set will be ordered if you are low or borderline.


Good luck

Answer 2

First, implantation has to occur, this is usually about 7 days after conception. The earliest tests can sometimes detect a pregnancy as early as 8 days after ovulation.

Many pregnancy tests detect 25mIU/mL & that is good enough to detect a pregnancy a day or two before your period is due.

Remember though, that many pregnancies don't develop and that if you test early, you could detect a pregnancy that doesn't go on - one that if you hadn't tested for, you would never know about because you'd have gotten your period at the regular time - this is one of the major disadvantages of testing too early.

Good luck!

Answer 3

It takes a fertilized egg about a week to make it into the uterus to start implanting, then a couple of days before there is any noticeable rise in HCG. The *earliest* you could expect to get a positive test from any test is 8 days after ovulation (which could be up to 13 days following sex that led to pregnancy).

Answer 4

Fertilised Egg

Answer 5

after 14 days the levels rise. test after your missed period.

Answer 6

HCG level rise at around two to three weeks period ...

Answer 7

in my enthusiasm in getting pregnant i was v. eager to do pregnancy test two week after i did it with my spouse...i was so crazy that i even counted my ovulation dates and even force my hub to do it when the days are rite...and most of those times i was dissapointed wit the negative results until one of the month i decided to stop being so crazy and let things flow and surprise when i check the test when i missed my menses i was pregnant>>>so my suggestion would be to wait at least two weeks after yr menses is due before you check