So I had sex for the first time 5 days ago(with a condom) and I keep stressing out that I could be pregnant. It was in the back seat of my car but it lasted less than a minute because we are both taller and couldn't really make it work. Is it normal to for stress to cause me to feel sick? I have cramps and a headache that comes and goes and keep using the bathroom. Is this all normal? I got on birth control yesterday (4days after having sex with a condom). What could me feeling sick mean? The symptoms are the same to when I feel my period coming. What should I think??