It's cycle day 18 and still no BBT rise. Turns out it's probably a good thing I decided to track my BBT after all - looking at this month's chart and last I think I've discovered I have a short luteal phase. One needs a luteal phase that is longer than 10 days in order to allow the fertilized egg to implant. Basically a luteal phase that is too short can lead to infertility or an increased risk of miscarriage.
This is interesting to me. After I had my initial bloodwork done, my GP noted that I had fairly low progesterone. The specialist dismissed that result saying it was taken at the wrong time, and said nothing about my bloodwork results after I had the second workup. But there's a pattern here that is starting to make sense to me.
According to a study I was able to find online, women with endometriosis have a higher than average likelihood of a short luteal phase. All these things: endometriosis, short luteal phase, low progesterone are commonly associated.
I don't know why all this matters to me right now, but I guess I'm just appreciating that it looks more and more certain that endometriosis is a correct diagnosis and that this lap is a good idea, rather than wasting sperm.