5 days early from expected period day

Okay y’all I’m confused af right now. The reason why I’m over thinking is because my s/o ejaculated in me this whole month, during my fertile window as well. The confusing part is that I started bleeding light brown on the first day which would be the 24th. My expected period day was the 29th. The color ranges from brown / pink/ light red. Another confusing thing is that the flow kinda stops; basically comes and goes through out the day. (12 dpo)😩 has anyone else gone through this?!?! Did my period just happen to come early lol I’m overthinking too much