Pregnancy Timeline & Paternity Concerns: Understanding Your Situation

Question
my LMP was 16 march 2008.missed April period.USS dated preg as 8weeks in may.had another partner in early march.scared the 16th march period was a withdrawal bleed.feb LMP was on the 18th.my period is regular.baby looks like neither of us.i mean the guy i was with in the later part of march.m freaking out

Answer
Lady,

You conceived in March, not February.  A fetus on an 8 week ultrasound looks much, much different from a 12 week one, which is what you would have seen had you conceived in February.  You would have ovulated near the end of March as well so the timing fits perfectly.

See http://pregnancy.about.com/od/pregnancycalendar/ig/8-Week-Ultrasound-Photos/ for 8 week photos vs http://pregnancy.about.com/od/pregnancycalendar/ig/12-Week-Ultrasound-Photos/ for 12 week photos


Best,
Catherine