Period talk

So last month I didn’t get my period for the reason I’m stressed out with school, totally Normal. I’m on birth control, I have been on it for 11 months now take it regularly same time every day. My boyfriend on Tuesday we decided to have sex and he came in me. I’m suppose to get my period next week Friday. I know I’m not pregnant.

I’m having horrible cramping, I’m exhausted, my back is killing me and I feel so emotional but drained. All key symptoms I get before my period but it’s a week away. Has anyone got there period early on the pill or is this pms?