I told my Dr. I wanted to start using progesterone cream because i have been spotting the past three cycles all during my LP. The nurse said it would probably do nothing, but it wouldn't hurt if I wanted to try it. I bought some over the counter cream. No spotting so far, but I don't know if it's causing my temps to be high because I may have started it too early.
Kind of a tough call; even thought your OPK tested + on day 13, by your temps and the rise right after CD17, I would have to agree with the other girls and say 17 is your lucky number.
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Re: chart stalkers if you don't mind...