What is going on

Im 18. I had my last period oct 30-nov4. I lost my virginity on nov.9th (pullout) to my boyfriend *i started ovulation the day before* and Had sex for the second time yesterday (nov 17) (condom and pull out) and tonight i experienced light pink yet brownish discharge..

I have Cramps. Headaches. bloating. Dizzyness. Tender breast and sensitive nipples heatflashes (normally every once n a while) and according to the prediction on here my period starts on the 27th of nov. Am i just scaring myself or do i have something to worry about?