Hi I Randomly Started Bleeding From My Vagina Last Night.

Hi I randomly started bleeding from my vagina last night. I have been getting cramps last week as well and I'm not supposed to get my period until aroudn Feb 15th. I have been in BIrthcontrol for 3 years except this past December bc I went to Cali for a month. I got back on the pill Jan 14th I think ? I started smoking weed again last week , I take hydroxicut. I seeing someone and I just started messing with someone else about 3 weeks ago too. So I basically have 2 sexual partners. Idk why I'm bleeding but it's like a light blood. Kinda cleanish type blood. Please help me