I don't want to sound stupid

I started my ovulation 2 day ago. I had sex the day before I started and the next day. Today I woke up feeling nauseous, I've been like this all day long, I tried to eat but vomit everything I ate. I took some medicine but nothing works. Last night I didn't eat anything unusual. I don't have any other symptom. It is not possible to have pregnancy symptom, this early, right?!? please don't be rude!