5 days ago, I had unprotected sex for the first time and my gf was on her last day of her period and she bled while we had sex. I thought I was fine since I took a shower right after. But around 2 - 3 days ago, I noticed 3 bumps on my pubic area (above the penis area) and one of them turned into a whitehead pimple within the day after I noticed them. One of the other ones looks like it turned into a white head but not sure if it is (feels more like an ingrown hair thing) and the last bump looks like it's going away and it's fading almost not noticeable. So, I'm freaking out cuz idk if this is an STD or not. The whitehead pimple doesn't necessarily feel painful unless I poke at it and it doesn't hurt that much when I do. Please help!!! I'm really scared that I could have an STD.