micronor is the mini-pill and can make periods irregular and sometimes stop. I'd take a test just to be sure though.
from netdoctor site about micronor:
The progesterone only pill can often cause menstrual irregularities, such as irregular bleeding or missed periods. These can be annoying, but tend to settle down after a while. If you have continued problems with irregular bleeding you should talk to your doctor. If you are worried that you could be pregnant because you have not had a period, you should ask your doctor or nurse for advice or do a pregnancy test. However, if you took all your pills correctly and you didn't have an upset stomach or take any other medicines which might affect the POP (see end of factsheet), then it is unlikely you are pregnant.
Read more: www.netdoctor.co.uk/sex-and-relationships/medicines/micronor.html#ixzz2M671yM9S
I fell pregnant on the mini pill and still haven't a clue how.
Found out at 23 weeks.
<glares at mini pill baby on play mat>
Wouldn't change it though
minicreamegg
Wed 27-Feb-13 11:28:12
My friend did but she suffers from IBS so her stomach was all over the place.
Take a test to put you're mind at rest.
WakeyCakey
Wed 27-Feb-13 11:41:35
Take a test. Hope you get the answer you are after. If it comes negative is there any chance you can swap your contraception to something like the coil to give you more confidence in it?
Good luck hope you are ok and your DD is feeling better
Thanks for the messages. I think i might buy a test and take it home after work. Best not do that kind of thing at work 
minicreamegg
Wed 27-Feb-13 16:44:43
Good luck
Let us nosey folk know
Done the test and it is negative, feeling better already. 
Glad you got the result you wanted 
dimdommilpot
Thu 28-Feb-13 14:15:37
I fell pregnant on the pill looks at 2.4yr old DD watching Mickey Mouse