HELPP!!!! 😩😩

So I’m 17 years old and I started taking birth control for 4 weeks already and I feel SHITTY !!!!!!! Like I keep throwing up , cramping , breast tenderness, Nausea , headaches, diarrhea... is it normal like I’m supposed to start my period 2 days ago I took 4 pregnancy test all came out negative! During those 4 weeks I was sexually active with protection. I’m just so stressed and I’m so confused I keep on spotting and cramping because I stopped taking it so I’m just cramping and spotting.. what could it be .. what should I do... did I start my period or no... I need help guys ..