Help🤢 (plan b)

So about 5 days ago I got off of my period and I had unprotected sex that day and felt like he didn’t pull out so I took a plan b, (also I’m not on birth control) and I’ve been spotting ever since but nothing bad... and today I woke up and went to the bathroom and blood just kinda started flowing out of me. My stomach also hurts a little almost like I’m on my period again. I don’t know if this has to do with the plan b or if it makes you start your period again.. and also this is my first time taking plan b. Can plan b make your uterus sore and make you bleed 5 days later?