I need your help because I dont know what is going on.

Patient: I think my last period was in may and I spotted in june, spotted in july, I missed august and I spotted in september. I believe I started spotted after sex all three times. It is now october and I did not get my period. I also took several hpt, doctor test and a blood test they are all negative. With having said that my question why would my cervix ne open if I am not pregnany?