My period is three days late. What's going on?

Anonymous
I am now three days late for my period. There are no chances of me being pregnant either. I have discharge, and it is watery. usually when I get my period, it is ALWAYS on time, and for about three days before, I will be getting cramps. however, I haven't gotten cramps, which means I don't have signs of my period coming. I am suspected of having endometriosis, even though my first laparoscopy came back negative. My doctors still believe I have it. However I have never missed a period, or it has never been late. I don't know why this is. please help. I honestly don't know any factors causing this. in addition to this, I have been having sharp pains in my lower pelvis. however, it only occurs when I go to sit down. the moment my bottom side hits the chair, it's like I get a small sharp pain (as though something is pushing into me) in my lower left pelvis.
My period is three days late. What's going on?
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