I was 8DPO when I had my blood taken because thats when the spotting had started again that cycle, so that would have been CD25.

I had the blood tests done because of my spotting throughout my LP. Basically if your progesterone levels come back within the normal range, then it is considered that you are ovulating...as you only begin to produce progesterone when you ovulate....plus they check that the luetinzing hormone levels are there as well to indicate an eggs release.

So yes, i simply went in and requested a BT to check levels because of my spotting.