Thanks for your reply and your support- I thought LPD would result in early losses too. However, I thought, maybe progesteron is high enough for implantation, but not high enough to help let the placenta take over.
Typically with hormonal problems the embryonic pregnancy is lost heralded by bleeding. In miscarriage the progesterone begins to decrease prior to a decrease in HCG.
I didn't know this.

I do feel like I'm clutching at straws a bit, but I figure, if it can't hurt, then maybe try it anyway?

I'm really pleased I have a GP who's so supportive - having had 2 m/c herself she can relate and her philosophy is not to wait for recurrent m/c's before testing (her words: it would be sadistic to do that). However, she wants me to talk to a Gyn before doing anymore hormone testing. I also know using progesterone won't guarantee anything - my GP had another client who after 2 m/c, used progesterone - baby stuck but was born with a trisomy and died at 5 months (she did go on to have a healthy baby later).

I realise every pregnancy is a roll of the dice. I just hope doing something may prevent this ever happening to us again. Also, "doing something" makes me feel like I have some kind of control over things.... which this m/c has taught me is so not the case