I need some advice😩

Okay so, I've been on BC for almost a month now, I'm taking my sugar pills at the moment

(I've been taking my sugar pills for 4 days now)

These past 4 days I've been cramping like really bad.

(My actual period without BC, I never cramped, or only had one cramp.)

Today I had, as my doc calls it, "random spotting" but it was like a lot of blood🤔

(It was a brown color, and a light red)

Q- how much bleeding should there be? Q- how long should it last? Q- should i be worried? Q- should I talk to my doc? Q- is this very normal?? Like common?

Btw I am sexually active. (Kinda)

I am 15-16

And I take my pills at night (10:30ish) every night.

I'm not on any other meds.

I hope this info is helpful.

I just need some answers. And I appreciate anyone's opinions❤️