Lack of education?
From recent posts I feel like there are a bunch of women here who are shooting in the dark, hoping that just some unprotected sex along with this app will get them pregnant.
If you haven't already, you should read Taking Charge of Your Fertility. It explains BBT, CM, cervix position.
If you haven't already, you need to get in to a doctor and have your beginning of cycle hormone check: so you know what FSH, LH, estradiol, AMH you're dealing with. If you can see a RE, all the better because maybe you can have an ultrasound to see how many follicules you have left. Or an hSG to check if your tubes are clear. You also need a few STD tests to make sure you don't have, for example, a silent (symptomless) case of chlamydia which could mess with conception, or put a baby at risk if you do get knocked up. A RE work up is invaluable to a woman TTC in her 40s.
You also need a full thyroid panel run. TSH, FT3, FT4, TPO AB, TgAB. If you do discover a thyroid issue then you need to know if you have an auto-immune problem.
Only after all that testing would I be comfortable making the decision to try "naturally" or via intervention like an <a href="https://glowing.com/glow-fertility-program">IUI</a> or <a href="https://glowing.com/glow-fertility-program">IVF</a>.
You need to chart temps! You need a picture of your whole cycle, for each month you try. Then you can see for yourself whether or not you're ovulating late, if you have progesterone issues, or a short Luteal phase. More importantly you can track the time you ovulate and see if you're timing sex properly.
If you're over 49 you can't afford to operate in the dark. You can't drift passively from month to month wondering why isn't this working?? Be aggressive ladies. Baby dust to you all.
Achieve your health goals from period to parenting.