Anyone used these? The Proov app tells me to test 4 days in a row from 7d post lh peak (dpp), but the Easy@home app suggests I take one test at 7dpo. My LH peak was almost 3 days long this month from the 18th-20th, so it's hard to know where 7dpp or 7dpo is. The pdg tests are expensive and I'm not keen to waste 4 of them when it's not even clear when I ovulated. I'm wondering if I have low progesterone as my period keeps coming on cycle day 9. Could I just test at 7 & 9dpo? Or would you give up this cycle and wait until next month?