Hi. Im am 24 and have a partner. I have been taking micronor for approx 3-4wks. I am sexually active. For the last few days i have been having painful cramps and lower back pain.. Almost like period pain.. But no period.. Does micronor stop periods? I only ask because i was previously on cerazette and that stopped my period and thus havnt had one for about 6-7months. I stopped cerazette one day and started micronor the day after.. And like i say this was about 3-4wks ago. Can anyone tell me why i am cramping like this??? Am i about to have my period..?