intercourse on 2nd day of period, fiance ejaculated inside

I was on 2nd day of period when had intercourse with fiance. Periods are always normal. We tried for a child one week after my last period and also during week of ovulation. My concern is that after the last time he had ejaculated during day two of period, the following day it was completly absent. It usualy last 4-5 days. Can a pregnancy happen during period when he ejaculates inside and cause your period to stop?