Well I was in a relationship with this younger guy for about two months then we finally had sex unprotected on a Friday night /Saturday morning. Three days later on my sister's birthday I had sex with my ex and the rubber popped and he too cummed inside of me. I went to the hospital in June around my birthday and I found out that I was pregnant. I told my ex... Then in July I had a threatening miscarriage where they had to do an ultrasound. It said I was 8 weeks and 2 days. When I counted back to the date it was May 16, and i slept with my ex May 19th. Do you think the ultrasound was accurate enough to exclude my ex out of the picture or do you think it was too close to actually tell?