I had my last period on December 24, 2016, my cycles have been a bit irregular in the past few months but prior to they were about 33-35 day cycles. I think they were irregular due to medication. I had sex all of January with the same guy off and on without protection, I had sex a different guy on January 21, however, he pulled out before ejaculating all over me. I am hoping the first guy is the father of my child, but I can't stop thinking about the slight chance of the other. I had spotting on January 23-25, it was dark brown and off and on all day long. I went to the doctor on March 7th and had an ultrasound making my due date October 11. At my next appointment, I told the dr about my LMP being December 24th and she changed my due date to October 7th. With these dates, It is said that my ovulation and fertile period should have been between January 12-18. I do believe this to be true because I was tracking my CM and symptoms. Also, the january bleeding seems to be implantation bleeding. I just want some insight on the situation.