Hello. I have an desperate question! I had unprotected sex on 10/23 - 10/25. I then had a period on 10/31 but do not recall how "normal" it was. I then had unprotected sex again on 11/14 - 11/20 but my partner did not ejaculate inside of me fully. Positive pregnancy test on 12/3. Had HCG blood test on 12/4 with result of 70. Had another HCG test on 12/8 with result of 450. I then had an ultrasound on 12/15 and they said I was around 6 weeks!?!? I dont understand as it seems 6 weeks would put me in the middle of the two! There is a question of paternity here this is why I am so concerned! How accurate are early ultrasounds? With almost four weeks in between the dates of sex could this be narrowed down to a specific time frame? THANK YOU!!