cramping while pregnant?

Gracie
Hi girls! I'm curious, AF was due the 26th and I took a pregnancy yesterday which came out (faintly) positive. However I've been dying of cramps since last night and even this morning. I did feel a different feeling a couple of days ago where I felt cramping only on my sides but now it's as if AF is creeping up! In the past, i suffered of very painful cramps, so much it would knock me down and id have to roll in pain. They're not as severe right now and there's no spotting or sign of blood but is severe cramping normal? I have a doctors appointment tomorrow.