No period

So I haven’t been in birth control in a few years. When I got off my periods were still pretty regular then I got pregnant. I had my first period August 14. Then I started my birth control August 20th, so September 10th I started the pills for your period but I didn’t get it until the 12th so two days in. Now I’ve been having symptoms like I’m going to start my period mostly cramping but I still haven’t and tomorrow will be the 3rd day of the green pills. Im just wondering if this is normal since my period seemed pretty regular the first month I started BC. I take trinessa. I took this before but my periods were irregular then so that’s why I started it, and it’s been so long I can’t remember if it messed up my periods still when I first started.