Help determining accurate due date.

Patient : Hi, I am now 21 weeks one day pregnant according to my last period. My last period was may 14th 2014. The issue is im not sure who the father of my child is. I had sex with another man on the 17th of may while I was still on my period. But I had an appointment on the 12th of Sept. and the fetus was measuring at 17 weeks and one day so that keeps me on track for getting pregnant after my period ended, I always have regular periods on the same date every month. my question is what are the chances that I got pregnant while I was on my period.
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