I got some questions

Okay y’all so for some weird reason I’ve been getting my period twice a month and I’m on birth control been taking it for 3 years now and I just have been starting to bleed for two weeks a month... getting super annoyed with it and I was wondering if any of y’all have experienced this as well.... also my cramps were so bad yesterday idk what it was but I felt like I was going to throw up my whole stomach I’ve never felt like that in my lifeeeee when I tell u it was bad it was so fucking bad excuse my language... but I don’t think I’m pregnant I mean I’m taking the highest dose of birth control and the whole period thing