My period is 4 days late, I've been on my period for 6 years and never once been late. I was on the pill and stopped taking it one month ago and my period was normal but now I was expecting to come on my period 4 days ago and still haven't came on, I have been feeling sick and breasts have felt sensitive I have also felt very fatigue and going to toilet more frequently. Could anyone give me any advice on what it could be, thank you