Awkwardness

I just or my period today!!( im12) so I have had white stuff in my underwear for a while now And it seemed normal so it didn’t bother me and I was sitting k. The couch and I went into the bathroom and I had underwear on that had blood on the sides(cuz I cut my lower thigh shaving) and I thought whatch me get my period and I wiped and I saw red stuff and I thought wtf!!? So I wiped and wiped again and sure enough….it was my first period. I haven’t told my mom yet though