Could i be pregnant?

So I have had unprotected several time in the past two weeks. and was told that after ur period 15 days later is ur mostly time to get pregnant. well my boyfriend has cam inside of me during this time and i have been getting midnight cravings for everything that i can smell.. but when i eat some of the foods that i am craving i stop midway and want to just throw it all up.. and i also get these sharp cramps in my side.... and my next period doesnt come until the first of the month.. so can someone please help