What to do?

Ch

I'm 42. I got off the pill this summer. Doctor told me to wait 3 months before TTC to give my uterus lining time to thicken. She saw no reason I couldn't get pregnant. Fast forward. We've been TTC for 4 months. BFN this morning. Cramping and sore nips but no bleeding. AF due today. I turn 43 in 3 months. Do I start the fertility process now or wait 2 more months?

UPDATE: AF came. OB/Gyn ordered blood work to see current status and make sure it's not too late. I had CD3 blood work drawn yesterday. Nurse called today and it all looked normal/healthy, which is good. More blood work on CD21. Waiting for my first fertility clinic appointment. Thank you for all the support!