wtf period 😭 ANSWRRRR

So I've been on the pill since October. My first period on the pill was awful, 15 days and horrible cramps. But on November it regulated it greatly, 5 days and mild cramps. Dec. 5 days and mild cramps. Jan. 5 days and mild cramps. BUT this month, for some reason it's going on it's 9th day with medium-ish cramps. WHY?!😭😭😭