I had a miscrriage July 19th, I was 10 days late but tested negative whole time. I know it was a miscarriage because when I started bleeding a huge clot with grey tissue came out right before the bleeding. I bled non stop until the middle of sept then stoppped. Had a 2 week period that started oct 4th and ended around the 17th. Now from the first day of my last period I would be late again this month. Results are negative but ob nurse said none of this should affect my period so I am late? Any thoughts>