So I'm 22 going on 23 weeks and I have had very very light spotting an really bad cramping and my…

So I'm 22 going on 23 weeks and I have had very very light spotting an really bad cramping and my abdomen keeps tightening. I wet to the doctor for a check up yesterday an he said I looked great but this started right after the doctor appointment. I'm not to sure if I should worry or if I should relax because she didn't see a problem hours before it stated...