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Determining Paternity: Tracking Conception Dates and Pregnancy Timeline


Question
PLEASE I NEED YOUR HELP!
I need to know who the father of my baby is!
OK here goes:
Sex with #1 on January 13
Sex with #2 on January 22
I got my "period" February 1st (lasted 4 days and different to the usual).
Wondered if I was pregnant and decided to do a home test on January 25th. Which was negative.
Missed period March 1st/2nd.
Did pregnancy test March 8th - positive!
Had an ultrasound the following day and was assured by the OB/GYN that I conceived with #2 based on the size of the embryo and based on the fact that it was almost 2 months since sex with #1. She said it was very early, however I did give them my LMP date. So I hope the measurements of the embryo were not based on my dates and not the actual gestational age.
PLEASE HELP ME. I am desperate and am now in Week 19 of my preg. Dont know what to do.
All ultrasounds since have shown a fetus which is growing according to father number 2. (i.e. biparietal and ACircum.)
I still need your opinion and advice.

Answer
Your last period started on February 1, and it sounds normal even if it only lasted 4 days, you would have ovulated on February 14. A pregnancy test would not show a positive result until, at least 14-21 days. The best time to take the test would be 7 days after missing  next period. You were due for your period on February 28. Therefore you should have taken the pregnancy test seven days later, March 6, That is the most accurate time. Your last period started February, and are due on December 7. You are now around 20 weeks pregnant. Remember that a pregnancy is dated from the first day of  your menstrual, not from the date you conceive. A pregnancy is 40 weeks from the date of your last period.