Plan B- spotting 6 days before period

Sooo my partner and I had sex on ovulation day. (May 29th) 🤦🏻‍♀️ didn’t check my app or anything. We did it and took plan B 12 hours after! My period suppose to be here on June 12 and yesterday June 7th I was spotting brown light cramps. Today June 8th cramps are a bit more and sore breasts! I was bleeding red now back to brown. So I’m so confused. I have taken plan b before but I never had this happen. Especially cramping and light bleeding 6 days before expected period. Please tell me this is normal after taking plan b. Cause I’m worrying.