Pregnancy Timeline & Paternity Concerns: Understanding Conception & Due Date

Question
i am 21 y/o with i child i am now 6 months pregnant. i was told on november 30 i was 6 weeks 3-4 days pregnant by a sono they couldn;t go by my last period it was messed up because of the depo. my last period was on september 21 i didn't get one after that. i had sex on october 11 and 15 with my b/f and october 19 with someone else is there any possiblilty this isn't my b/f child i was told i concieved on october 31 my due date is july 24

Answer
If you are due on July 24, then you ovulated on October 31 and could have conceived if you had sex on October 30,31,November 1 or 2. This is only a guess. My calculations are, that if you were 6 weeks 3 days on November 30, you ovulated on October 15 and could have conceived if you had sex on October 14,15,16, or 17 Since you had sex on October 15 and then four days later, it is impossible to tell which guy is the father.If you are now 34 weeks pregnant, then you conceived around November 7, It is very confusing. (This is not a science). Ask your docto about the descrepency between November's results and April's results. (DepoProvera usually messes up a woman's cycle.)