10 days after unprotected sex, 9 days after take plan b pill, 3 days bleeding brown (counting today) my breast tender so much.

I’m so scared! I take the pill (MyWay) 3 days after period, like 15 hrs after sex, (day 8th of my period) I think I hadn't ovulated yet. He don’t cum inside me, but I don’t know about the precum. if anyone can help me I will appreciate it

btw. last night (11pm) I started to feel like ants on my legs, will it be from stress? Really I’m so scared!!! It’s my first time feeling like this, I had never had unprotected sex and had never taken that pill.