took plan b and got my period

Hey y'all I took plan b after me and my boyfriend hooked up and I got my period for the 2nd time this month and whenever I go to take the tampon out it starts hurting and I have been bleeding a lot of brown blood and I DONT HAVE AN GYNECOLOGIST and my mom won't take me to get myself looked at and I know I don't have any STDS OR ANYTHING LIKE THAT I was wondering why am I so sore in that area so if y'all don't mind helping me out i would greatly appreciate it