Has anyone done a progesterone test like this one? It says to do it 7 days before your next period, or 21 days after your last. My cycles are only 25 days, would this work? When would I take it? I haven't bought it yet as don't want to spend if its no good for me and information on the website is limited. I'm concerned my progesterone is still too low after coming off the progesterone only pill in August and would like something to check before I ask my GP as its only been a few months. Looking for people's experience before I spend 40 squids!