Could i be pregnant

So I know girls can have a period and still be pregnat... well i just got off my period but i have been craving anything and everything... my boobs are sore as a mofo... and my stomach feels weird... and last week me and my bf had sex 4 times where he cummed in me all 4 times in a 2 day period.... so should i be freaking out or is there something else that couls be happening... I am only 16... and my bf is 18 about to be 19 and my parents dont know please any tip, advice would be helpful