Miscarriage

I been taking birth control for two months in the second month I missed a pill but I didn't realize it until the en of the paket so I started taking the sugar piils for my period first days were ok but then on day I got really bad cramps and I felt like I had to go pee really bad and so I went bt there was no pee it was jst this does someone know if it could of been a miscarriage  or something oh and two day before that I been really dizzy