Hi, my question is, I took norhisterone from 18th to 23rd november 2014. My period was due on the 21st november. But I never got it after I finished the tablets. I have recently realised I am pregnant. Is it possible that I could have become pregnant while I was on norhisterone? I don't think I would have been ovulating then as that is the time I should have been on my period? Is it still possible that I could have become pregnant between 18-23rd november?