Im not "regular"

Lupita
So i don't regularly get my period on time...usually about every3-6 months...my last period was in November....on or around the 8th we had a miss-hap where the condom slipped off. I've been really tired for the past week or so(really not like me)...my boobs are really sore...ive felt light cramps...today i started feeling a bit of nausea...ooo and ive been soo hungry lol...i took a test today(clearblue) came back negative....help !!!do you guys think theres a possibility i am pregnant? Should i retest soon? Or maybe next week?