Am I being paranoid??

I had sex for a couple days after my period (first times having sex). We used a condom and the pull out method, with no tears or slips with the condom. Yesterday I started ovulating, and today I feel sick, with major bloating, cramps, and slight back pain and head aches. I also feel light headed and a little nauseous. I didn't know if it was symptoms from ovulating or if its early pregnancy symptoms? When do you start getting pregnancy symptoms? Or am I just being paranoid..