The condom tore while having intercourse. He understood and we stopped immediately. He was sure he did not come inside me since we had just started. I got my periods immediately after two days... however I am feeling a little bit of nauseous... I mean I am getting the feeling to puke but m not xactly puking... my spun a little but I didn't fall or anything and m feeling a bit weak.. I have low pressure and little acidity problems... is it because of that or am I pregnant?? Please help.

There may not have been any semen, who knows, but pre-ejaculate is just as powerful, and there would have been that. Wait 2 or 3 weeks and test with first morning urine.