GoodMorning, I Have A Question. The Month Of December I

GoodMorning, i have a question. The month of December i got my period on the 11th and it ended on early morning on the 17th but i had unprotected sex on the 22nd and the 31st. Since the 22nd I've been feeling very sleepy more than usual,hungry but only could eat small portions of food but going back to eat like every 30 mins because it was feeling as if i had never eaten. My body has been feeling very weak,not really wanting to get out the bed. I've been having the use the bathroom very very often. Nauseous after eating some food that i usually like to eat but haven't really thrown up it just feels as if i need to but haven't actually done it. Then the 1st of this month my breast started to hurt being so tender and itchy around my nipples. Back hurts almost everyday. I've been having headaches but just something slight with the headaches. Then yesterday,january 8th i started to bleed very light pink with it being watery but then today it got a little more heavier but still a little watery but a have a little cramping not as bad as it usually is. Could I be pregnant? My periods are very irregular but they usually are pretty heavy at the beginning with thick dark clots and ease it's way lighter but this one started off lighter and not thick dark clots.