If you concieved oct 25 you would be due july 17th...those are my exact dates...there is no way your a whole month off like that...they would have told you and changed youe dates!!
Im due the same time and i only had sex the last week of November,so it would be your boyfriends .no worries
Try going on to google and type in conception calculator it gives u a range of when u became pregnant. That might help you out! Good luck!