Hi I Have Recently 4days Ago Stopped Using Norithestone Which

Hi I have recently 4days ago stopped using norithestone which I took as prescribed by my GP 3xdaily for 9 days which included 3 days prior to period due date for a delayed period for holiday purposes.I'm slightly worried as still haven't had a period I'm 44yrs have 3 grown up children and haven't used contraception for over 15years due to a tilted womb and septicemia after my last birth my chances of conception I thought were minimal however have been sexually active with my partner prior holiday is this just a side effect of taking norethistone as never taken before my period is usually early very heavy and lasts 7 days.