I have been on this mini pill for 16 days and it is making me so irritable and I want to stop. I did not wait until after my first cycle to start the pill, I got my period on day 9 of taking the pill. I do not want to get a period if I stop it, my question is, is 16 days of being on the minipill long enough to produce the effect of starting your period immediately (with in 2-3 days) after you stop the pill? Thank you so much.