no period?

I'm on my second month of birth control and me and my boyfriend had have had sex three times all using protection and birth control on time. I was having some discharge and cramps Sunday because it was my first day of plociblo pills me and my boyfriend had sex and now it the cramping and discharge has stopped. Does this mean I'm pregnant or just haven't started my period yet? I'm on the second day of my polcibo pills btw