I have my girlfriend who is pregnant now but I am confuse about the exact date on when was the pregnancy made? As she revealed to me that she has contact to her x boyfriend Last april 11 then she said she had a period by april 13 to 15. We made contact by May 7. She went for an ultrasound last July 12 and it says 12 weeks and 3 days the target date is april 11 then the next ultrasound on August 5 says 15 weeks and 3 days the target date is april 22. which is accurate? do you think i am the father of her pregnancy? Does her period on April 13 to 15 is consider as implantation bleeding? even if it is not a spotting? please help i am so confused.