Pregnant or tripping out

I’ve been off birth control for a little over a month. I’ve had my period 3 times this month THREE TIMES like hello what the hell? I didn’t really think anything of it just maybe my body getting used to being off the pill. My sister and a couple of my girlfriends think I could possibly be pregnant. The only form of birth control my husband and I use is the pill. Idk I could just be tripping out

Is this totally unheard of? Im also throwing up but I think it’s the flu