Scared I'm pregnant. Help

I recently lost my virginity a few weeks ago. We decided to do it again a few days ago a 2 days after having sex I bled abit. I thought I got my period so I put in a tampon but when I pulled it out there was barely any blood at all and it was only near the string of the tampon. After that there was no more blood. I also had really really bad cramps and I'm very scared something is wrong like I'm pregnant. I'm 16 and we used a new condom each time we did it I didn't feel it break and he said it didn't either so idk why I'm freaking out so much but omg someone help explain why I bled 2 DAYS AFTER!!!!