<s>[INST] i hope you can help me with my problem. Im half way in my pregnancy but i am not really sure who the father is. I first had my period round the 11th or 12th of june. My ovulation should have been round the 26th. I had sex with friend A on the 25th and 26th, and he came in me. Two days later i had sex with friend B, we did it twice in a row, but both times he didnt come in me. and i took "the morning after pill" the day after. So after that i had my period on the 9th or 10th of july (dont remember exactly). After this i have only had sex with friend A, havent had sex with friend B since that one day on the 28th/29th of june.. On august 5th when i should have gotten my period ( i have a cycle of 27 days every month ) I did a clear blue indicator test and it said was conceived 1-2 weeks, which means i was 4 weeks pregnant at the time. Period stayed away, i only had a little bit of brown blood like 2 weeks later when i was about 7 weeks if i remember correctly. I had an ultra sound on sept 2nd and my gyn told me i was 7 weeks and 5 days. I am so worried the period i had on the 9th of july wasnt a real period at all ( if i remember correctly i had it for about 3 days which i almost always have when on my period. but i dont remember if it was as heavy as regular ), and i am contstantly telling myself the indicator from clear blue can be wrong as well... I have also smoked cigarettes ( i stopped when i was 8 weeks ) so now im also telling myself because of the smoke the baby was smaller then she should be and that she wasnt really 7 weeks but more like 11 weeks from the month before... But on the ultra sound she really was a little shrimp, couldnt really tell it was a "baby"... im just losing it and i really want to hear ur thoughts.... Thank you for your help in advance. [/INST] Hi, You are pregnant with friend A, and your last menstrual period was on 9/10 of July. This corresponds to your ultrasound dates and your urine pregnancy result as well. Do not be anxious about it. Though the baby forms only after ovulation, the pregnancy is always calculated from the last period day, which might be confusing you. Do not worry, and the early pregnancy ultrasounds are very accurate in diagnosing the exact dates of pregnancy. You were wise to stop smoking, but smoking will not cause the early fetus to shrink as you have described. Smoking usually causes the baby in the last trimester to be underweight by 500 GMS or so. It doesn't affect so early in pregnancy. I would advise you to stay away from smoking and take help from smoking cessation services if required. Do not worry. Hope this helps. Regards. </s>