Pregnant or No?

So my period was heavy then quit heavy then quits all together.. My boyfriend has forgot three times before my period to pull out and got alittle bit in. So now my boobs are tender, i get nauseated alot and my stomach gets pains sometimes.. Im moody and whinny as hell, and people are questioning me if im okay cause im never like that. I just took a test and it said not pregnant. I dont usnderstand. Help please. Im freaking out.