Okay I found out I was pregnant January 25th. I cheated on my boyfriend December 12th but just that one time then a week later ever since it's just been me and my boyfriend. Estimated 7 weeks & 3 days as of 2/20/15. And my doctor actually measures the baby, like that's the size of the baby, so I'm not sure if it goes by last period. But she said my baby size is measuring 7 weeks & 3 days. Estimated due date is October 6. I had a period December 24th but right before I spotted for 2 days but then had a normal period. Could I have gotten pregnant December 12? Or later? Thanks !!!! Please don't judge me, I feel bad enough for this but no matter what this baby is a blessing!