so i’ve been on birth control for a month!

when i first started this period.. it was super super light, & brown. didn’t need a tampon. well i started my period week pills about 2 days after i got my period. & now my period has hit full force, it’s still light but heavier than it was... it’s a pinkish color with some brown mixed in... & my cramps have hit. is this normal? i’m guessing it got heavier bcus i started the other pills. it’s just been screwy!! i’ve only been on bc for a month so i’m guessing it’ll just take some time for it to take over & my periods be regular.