My uterus hurts, but no period?

I haven’t had a period in over 4 months due to my birth control. For about a week now, my uterus has been killing me. ( feels like I’m about to get my period) but, I know I’m not. But as of tonight, the pain has gotten so bad it’s spread into my hip and nearly to my knee, mostly my hip. I’m only 17.. could this be something to be worried about? Should I wake my mom up?
My uterus hurts, but no period?
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