Hi,I'm 22 years old and my boyfriend and I have been having very frequent sex but always with a condom. He does cum inside me but with the condom on. and sometimes we would try sex for a few seconds without a condom, initially, very early on before there's probably any precum or anything.I'm feeling very nauseous, I have a headache and I have bad cramps in my tummy but these could just be pre menstrual symptoms. How could I tell the difference? and what do you think the chances are of becoming pregnant from our use of condoms.Thanks :)