At The Beginning Of This Month I Had A Normal

At the beginning of this month i had a normal six day period, a week later i started bleeding again, i bled for four days, this time it was alot more painful as far as cramps go than any period id ever had. Before my original period i had unprotected sex three times. Is there any chance i could be pregnant. Or is there any reason i had like two periods in one month. Me and my fiancé are trying very hard to have a baby.