New to birth control

Katherine

I just started taking birth control about 3 weeks ago. And my period came earlier then expected I think due to me taking it at a different time because I am traveling and the times are changing. Anyways the first couple of days I couldn't even walk the cramps were so bad and I have never experienced cramps before. My period is much heavier as well and it is longer then it has ever been before. Can someone help me with what to do. If I stop taking them will my period continue on for the month? Can I bleed for months since I started this? Please help! Thank you in advanced!!