period or what?

I'm 16 and have recently had sex about 11/13 days ago once with a condom and once without (so twice) and I'm a little scared of being pregnant but my bf never ejaculated at all when we had sex but obvs there was precum so ya but now I have what I think is my period but I'm worried might be implantation bleeding. My periods are usually fairly heavy in the beginning and I usually have really bad cramps and they're usually also a kinda bright is red but this time it's not particularly heavy and I have light cramps and it's a lighter red, I'm going to wait a day or so to see if it is my period or not so I'll keep updating but I would really like to know people's thoughts 🙈