Kinda spotting?

I had period sex for the first time, I got my second period right on time, and now I’m maybe halfway through my cycle and spotting? Haven’t done anything since then, not on hormonal birth control or anything either. Sooo, has this happened to people? Should I be concerned? I’ve never seen this before & I did have my period since the last time I was active. But you know how googling paranoia kicks in!
Actual description: it’s like pink when I wipe, nothing actually leaking onto my underwear or anything.