Girls you're in the same boat I was, having consultants who just don't take you seriously!
Sometimes it's not that easy to get an accurate result with a longer cycle, but the simple answer if it's unknown when OV was exactly is to do repeat progesterone tests, so maybe a CD 21, a CD 23 and a CD 25...
Or even better to do a bloody ultrasound...
I would advise taking control and getting your GP onside and getting them to to the bloods, in the end my GP was as frustrated as me with the useless NHS consultants and was willing to do anything she could to help, it was my GP that did most of my diagnostics when I was trying to find out what was wrong.
Nicky if you're around 7, 8, or 9 dpo it's still worth doing the bloods, just pop and see your GP.
Also Hun, when I got preggers this time I got pretty intense cramps about 7dpo along with a warm feeling in my uterus, I remember calling hubby to tell him, FX your cramps are good news!
xx