freaking out..

I had sex July 9th for the first time. we used a condom and we didn't go that long for him to cum. we checked the condom after and everything was fine. I got my last period June 21st, now I have spotting. which I've never experienced before.. I've been spotting since 2 this morning but woke up to barely anything. I've had no other signs of pregnancy, what's going on?