No period for over two months. Tests negative.

I am 35 years old mother of one 16 yo son. I have been trying to conceive for over 10 years naturally. Not seriously though. Other than a small fibroid and an abnormal Pap (I was going for a copo until i missed my period) pCP/GYN said all looked well fertility wise about 2 yrs ago. Using the app for almost a year now. Started having irregular periods a year ago (figured that out thanks to glow šŸ˜Ž)cycle leveled out now I haven't had my period for two months and I have taken 2 tests both negative. Waiting on doctors appt. Has anyone else experienced anything like this? Freaking out a Lil.