Why does my body do this lol

Porscha

So my AF was due to start today, and instead I had some light pink and brown spotting. Along with this I had some light cramping. I was sure I would start my period since this morning me and my husband had sex and right after my stomach started cramping a little. About 2 hours later is when I noticed spotting but also it was mixed with semen so it seemed like more than what it was. I put a tampon in for a few hours and during the time it was in I had a little cramping. I took it out only to see there was a little bit of pink and brown on it but not anything for the tampon to really absorb for it was still compact and in its package shape if that makes since. Since then I’ve had no cramps and no more spotting. Has anyone else experienced this? Last month I had spotting and light cramping for 4 days before my period. Maybe this is just becoming a new normal for me. I normally don’t spot and only recently started to do so. Last month was the first month I ever spotted before a period.