Could i be pregnant or am i overthinking?

I had my period nov 13-16 and i had really bad cramps on nov 20th then the next day had light spotting that would only really show when i wipe but the spotting continued all the way to the 23rd and then it stopped and then again on the 26th every now and then i would have really bad cramps between them days my bf and i did have unprotected sex in November i dont know if its just me but i feel like everything is a symptom like body ache that i didnt have before my gums been bleeding lately and im always tired now but im not sure im supposed to get my period on dec 12