Should I be worried??☹

ong story short, I just had a baby back in July. Everything went fine with. I only bled for a week and started birth control a week post partum. At that time I tried the nuva ring, but that produced too many hormones and made me spot like crazy. I did however get a full period August 2nd-8th. After the three week cycle of the nuva ring I met with my doctor and switched to the pill. I haven't missed or skipped a day, I haven't taken any antibiotics. I didn't get a period for September? Should I be worried? My husband and I haven't been taking precautions as I'm on birth control, which yes. I know isn't always effective. How long did it take everyone else's cycles to go back to normal after having a baby? Should I take a test? I'm not trying to stress about it. I should also mention that when they did the pap smear at 6weeks post partum, they found abnormal cells and lesions. Not sure if this has anything to do with it. I go in for further testing in October.