The pullout method is a really bad method to use.. You should be using birth control or condoms.. Or both.. If you are getting your periods regularly I would say there is a slim slim chance you are pregnant. But there is a chance you are pregnant anytime you have sex so if you dont want to get pregnant I would advise you to get on birth control because like i said before the pullout method is not reliable. feeling nausious could be caused by lots of things.. sore breasts are usually a sign of an upcoming period or maybe they are growing.. depending on your age.. eating more can be a sign of a thyroid problem.. But maybe you just have an increase in appetite.. If you are worried about it take a pregnancy test, that is the only thing that will tell you for sure.
it sounds like signs of pregnancy. You should check your cycle shedule, when was your last one, when do u start your next, plus fighure out when you are ovulating too. I never ended up keeping track with any of that so when I found out I ended up being 2 months when I figured it out, had no signs, just didnt keep my period shedule on track. good luck hunn