Ovulation Calculator And Due Date

Mandy asks…

Can some one explain to me why the due date and blood test date are 2 weeks apart?

The due date calculator says I’m 10 weeks two days. And my doctor blood test says I’m 9-10 weeks on the 25 th watever that means. I’m really confused I don’t know what week to look up when I do the pregnancy tracker I’m just so confused with all these numbers some one please help.

Pregnancy Advisor’s answers:

Pregnancies are dated from the first day of your last period. But you dont’ actually conceive until around 2 weeks after that. So dating can be a bit confusing if you don’t know if you’re going by LMP or conception/gestational age.

(The practice of dating this way goes back to when nobody understood when women ovulated — or even that they DID ovulate. For millenia, it was assumed that the semen made the baby, and the mother just provided a ‘nest’ for it to grow. [And, in many cultures it was believed that if the 'nest' was a good one, baby would be a boy ... If not so good, it would be a girl.]. Nobody understood when/how ovulation happened, but they DID know that when a woman got pregnant, her periods stopped. So the last period made a convenient and obvious marker for the start of pregnancy.

Even though we now understand about ovulation, we still date pregnacies from the LMP … And unless your cycles are extremely long or short, that date still gives a close enough estimate.)

Betty asks…

How soon can I conceive after my huband ejaculates in me during ovulation?

My husband and I are trying for a baby. I’m new to this whole pregnancy thing and I’ve read it can be difficult to conceive for some women. Just recently I’ve ovulated and my husband has been ejaculating in me every other day (through the possible week I ovulated), and especially the day I really felt my ovulation we had sex. My ovulation days were from the 13th through the 18th. I’ve been nauseated for 2 days on & off during that period of ovulation From the 15th & 16th. I guess what I’m asking is, how long before you can conceive after ejaculation? Also is it possible to experience symptoms so soon if I did conceive? According to the due date calculator I’m only two weeks. But technically I’m not even pregnant yet. Or am I? Idk. This is very confusing. Help!

Pregnancy Advisor’s answers:

You would conceive in as little as 15 minutes or as many as 24 hours — the egg is good for about 24 hours, so that would be the outside time frame.

However, the egg does not implant, causing the hormones that produce the symptoms, for 7-10 days. So any symptoms before that time are not pregnancy related.

Sandra asks…

If you had a one night stand on march 9th 2012, what would the date range be for conception?

I’m askin for a friend who slept with a girl, and she’s claiming it is his kid. She keeps changing the due dates. Sonogram done on 10/10 said 29 weeks. We looked up reverse due date calculator and said the ovulation day would be 3/29 and implantation date would have been 4/7. So could this be his kid?

Pregnancy Advisor’s answers:

Before we get all bent out of shape at the girl, it’s good to remember that not even the doctors can nail down the conception time with any reasonable certaintly. And if a doctor can’t do it, a brainless calculator can’t.

In the third trimester, some babies are measuring big and others are measuring small. Some will be born early, and others will be born late. It doesn’t mean that the father isn’t the father. Your friend is entitled to a DNA test after the baby is born, and I recommend that he get one. But calling her a liar should definitely wait til after that.

With that said, she probably conceived within five days after sex, and implantation could have happened a week to 11 days later.

Mary asks…

How many weeks from your LMP can you get a positive pregnancy test?

When I use a due date calculator, one site tells me I can next week around the 28th december (which would make me 4 weeks) and another says the 4th of jan which will be at 5 weeks! I couldn’t wait 5 weeks!

Pregnancy Advisor’s answers:

It depends on your cycle. Pregnancy tests are usually accurate when taken at least 14 days after ovulation. Ovulation is usually 12-16 days before your next period. That works out pretty neatly as ‘test when you miss your period’.

Maria asks…

How can i be 7 weeks and 1 days pregnant (today is 27/11/09) when i only ovulated on 22/10/09?

I don’t understand, i ovulated on 22nd Oct 09, tested positive on 4th Nov – now to my calculation from ovulation date i am today 5 weeks and one day – so why are the due date calculators telling me im 7 weeks 1 day?

Do these online calculators go from your last period date? Or am i being totally blonde :-D haha


Pregnancy Advisor’s answers:

Pregnancy is always dated from the first day of your last period, meaning that in a 28 day cycle, by the time conception occurs, you are already counted as being 2 weeks pregnant.

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