Due date?

My periods have always been messed up, I would go 5 or 6 months at a time with out a period, and then I met my husband and I started having regular periods from being sexually active, and they come around the end of the month, I caint remember in jan of 2012 when I started my period but at the end of feb I found out I was pregnant and got a ultra sound march 15 and the tech said I was 6 weeks and 5 days and that my due date was nov 3 and that I most likely conceived feb 10 does that sound right?

That's just an estimate... it can actually be a few weeks in either direction.