Hi, So My Husband And I Broke Up For Awhile

Hi, so my husband and I broke up for awhile and I dated someone else. We had sex but he always pulled out. We didn't have sex the last week we were together. My husband and I got back together and had sex January 8th and 9th and then I got my period on January 11th. After my period was over we continue to have sex. He always cam inside me every time. I took a pregnancy test February 10th and it was negative and then I took one again February 14tg and it was positive. My due date is October 17th. I'm pretty positive it's my husbands baby but I really could use some reassurance. Everything I looked at says my conception date was probably January 25th. Does this seem accurate and like it all adds up? Could I have gotten pregnant before my period or before January 8th and still have an October 17th due date ?