Switching Birth Control And Doubts Of Pregnancy

Patient: I’ve been on the pill for 4 months now but this last month I was switched to a different brand. I took the new pills right after my old ones finished with no days off in between I haven’t missed any days and i take the pill pretty much the same time everyday. I’m on my 2 green inactive pill but no period yet. I feel cramps and I have a little brown discharge that I usually get right before my period but I also know those things can happen when you are pregnant and I did have unprotected sex. Should I be worried?

Symptoms: Cramps, discharge