did anyone else go though this?

took my prenatal and threw up 15 min later. been feeling weird. have had light pink spotting for like 6 or 7 days now, like super light, not even enough to actually need to change a panty liner for an entire day. wtf is going on body? stahp it! plus random nausea here and there, and this super light pink spotting is happening in the time frame of waiting on my period so that could be it maybe? It's really wierd though. I have always had heavy-ish bleeding. but this is my first full month without birth control. it's just not what I was expecting. I figured my period would come back and be as heavy and erratic (normally being early or in a few instances twice a month) as it had always been before bc. anyone else deal with this kind of stuff when they came off their birth control?