I booked into see a FS. They can do a BT to test your progesterone, but the length of your luteal phase is a good guide. Mine was 9 days and because i knew that they didn't bother with a BT. They say you should have 10 at a bare minimum, but I have seen several women on BB fall with 9 days, so it's not that clear cut. Knowing when you ovulate it also helpful as ovulation and luteal phase can be interlinked for some people. I had ovulation at 21+ days. With me they treated ovulation with clomid and then FSH injections as I had -ve side effects from clomid. I also had progesterone pessaries (used internally). This combination gave me ovulation around CD14 and a long luteal phase. I actually had to stop taking the pessaries in order to get AF, and then it took me 2-3 days for AF to arrive.
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