Is this because of my birth control?

kait

I’ve been on birth control for about a month now because I had such bad cramps. The thing is though, my periods were pretty normal, they lasted five days and were every month. Not much was weird. But then my last period was much longer and instead of having two days of intolerable cramps, I had seven days of bad but tolerable cramps. And i just started my period again after less than a week between them.