Birth control not helping periods

marie

I got on the birth control pill called synrox in March and it is now a month now since I been on it . So I’m in the placebo section now and I just got my period today and shit is so heavy like wtf isn’t birth control suppose to help the cramps bruh I’m mad. And also 2-3 weeks before I got my period I had massive severe cramps and pelvic pain I’m worried .