NEED HELP ASAP

The beginning of last month I had unprotected sex (he didnt cum) few days later I get period which only lasted about 4-5 days when usually it last a about 6-7 days two weeks later I get my period AGAIN which isn't normal for me it's the first time its happened well now I'm on period 3rd day and somewhat light it's not like my normal days I'm not bleeding as much soo could I be pregnant??should I be worried??what's happening??? Or I'm just freaking myself out?? heeeeelpp