I don’t have a problem with her profiting from it, but yes, the next step would be something you insert that gives a serious chemical / hormonal read.
I did temps for over 6 years, no preg. Infertile. Temps alone would not have cut it. Thank Gd (and I do) that I kicked infertility in the butt. Only one of my four was conceived without a lot of help.
If you feel so inclined, would you like to explain briefly how you kicked infertility in the butt? It sounds inspirational!