determination

[mrs_tru]

I was wondering how long in your pregnancy do you have to be for it to show up on a pregnancy test.I've been trying to figure out when I conceived my son.Because of moving circumstances I wasn't able to see a doctor till last week Thursday.She did an ultrasound and by the measurements of the ultrasound she said that I was due Nov.8.I don't think it's accurate for the simple fact that a positive pregnancy test came up on the fourteenth of feburary of this year.I remember my lmp being around the third or fourth of jan of 08.I figured that if my due date was to be Nov.8 that  would mean that I would have conceived between the 11 to 15 of feburary and if that was the case my test wouldn't have been       positive on the 14th of the same month.That's why I'm wondering how far along do you have to be in a pregnancy for your test to show up.I also took a home pregnancy test the beginning of feburary not sure what day and those two test also came up positive.Can anyone help me to when I conceived?

[KM604]

If you go to any website that calculates the due date, you can input your last period date and it will probably show up around October 8 (I just checked a site for you - just google "when am i due").  But based on when they say you conceived, November 8 sounds right.  The only thing I can think that happened, is you didn't ovulate when you should have - are your periods normal?? If your periods are irregular then it is definitly possible that you ovulated later, which means you would have conceived later.

[Griggsy]

I would say that you would have conceived 11-16 days after your LMP. Which would still put you in January. That's only if you ovulated in the normal range. You may have had a late ovulation. The doctor may be going off of the current size of your baby. With it being this late in your pregnancy, I'm surprised they are changing things around, and that they haven't made up their minds yet.

Good luck! You may get your baby sooner, rather than later.