missed period. please help.

My last period was march 31st. I stopped my birth control the last day of my period. Ive been ttc throughout the month of april. I missed my period which was supposed to start on April 28th. Im now 9 days late. Negative hpt and negative blood test. Can i still possibly ovulate and get pregnant before i get my next period? My fertile window is this week. My cm is watery but not stretchy. Someone PLEASE help. It would mean the world to me.