Hi, I had my last period on 12th April, 2011 and intercourse on 19th Apr with one partner, and from 21st-24th Apr with another partner. I tested positive on a home test kit 10 days ago but a very faint band was there. After 2 days also, there was not much change in band intensity but a test yesterday showed a dark line. Just got an ultrasound done and it says I am 4 weeks +/- 3 days pregnant. My confusion is - 1. Can I conceive during my periods (4 weeks + 3 days, when I was bleeding)? 2. The online conception calculators for a 29-30 days cycle (a very regular one) give my conception date around 26th Apr (by giving LMP as 12th Apr). What are the chances I conceived before that? 3. If I conceived before that, why am I not showing any symptoms of pregnancy? 4. My ultrasound scan shows 7 mm sac like structure in endometrium (uterus size is 64X34X44 mm) but NO YOLK SAC/FETAL POLE. (I got a vaginal scan done for this, as an abdominal scan didn t show anything at all). Can somebody please help me out in finding when I possibly would have conceived? I am anxious because I won t be able to go ahead with the pregnancy if I conceived due to the act on 19th. I would appreciate an early reply very much. Waiting anxiously..