The pill and how to go about it

I've heard or maybe inferred that taking the pill or any type of birth control would help regulate my period, give me less cramps, and bonus help me gain s little weight since I'm on the skinny side. I just wanna make sure I'm making the right decision. Me and my mother talked about it last night and I don't think she gets what this means to me. Even this morning I asked her to get new pads even though she bought a new pack but for her since her period may be lighter than mines and I admit my flow is fairly heavy for the 4 out of 5 days of my period. I don't think she understands that. Please help