Paternity ?

Hi im tommy i have a question i need to know .. ok my ex girl friend found out she was pregnant on aug 3 2008 and the ultrasound said she was 4 weeks and 4 days and gave her a due date of april 12 2009. she had alot more ultrasounds after that one and they all came out that date or around that date like 2 days off .. her and her current boyfriend split up on june 3 2008 and me and her had unproteceted sex on june 7 2008 but only that one time . than her n her current boyfriend got back together on june 10 2008... and she been wit him only since than ... she told me she has irregular periods but her doctor said that it isnt possible for me to be the father ... her current boyfriend is the father because she likely concived around july 20 and we never had sex in july.. she had the baby on april 10 2009 she had to get induced she wasnt dialated any wen she went to the hospital ..i guess the baby wasnt ready to come out ..so she wanted to get induced.. she told me that if she got pregnat when we had sex on june 7 2008 the baby would ve been due feb 30 2009 or march 1 2008 and there was no way she would of been 6 weeks over due and the ultrasound couldnt be off 6 weeks ....the baby was 7lb o.2 inches and 2o ins long .... so please tell me if she id right?





one more question if her blood type is 0%2b and her current boyfriends is a - would the baby be o-?

thank u please help me i need to knw if im the father