Ovulating??

Jackie • Hello! I`m 31 years old. I have a 7 year old son and a 3 year old daughter. My hubby and I are trying for our 3rd baby!
Is it possible to ovulate even though my ovulation tests have been negative for a week? Only reason I ask is despite the tests, my CM and slight cramping is making me thinking am. Or possible implantation. It's hard for me to know because my cycles are irregular.