Plan b pill

Can someone please help me. So I had swx and he came in me and so afterwards he went to the store and got me a plan b pill well it's now the theirs day and yesterday I had took a nap after school and I had a tampom in cause the day before I started my period so I take it out and I go to put one back in and not to mention when I woke up on my ovaries area was hurting like pressure right there and so I go to put a tampon in and it felt like it moved something or hit something when I put it in and it just made the pain worse so now it won't go away it feels like someone has ahold of my ovaries and won't let go and there's a lot of pressure and just a min ago I went to pee and it hurt then when I was peeing my vagina don't hurt its my lower stomach also to mention I've never had really any cramping ever with period only back pain so is this cramping cause the pain has not let up any and I'm kinda scared something is wrong