I also used progesterone pills both orally and vaginally. Needless to say, after going vaginally, I can't bear the thought of swallowing them. My RE says its more effective to take it vaginally. I hope you are okay and this dip in your HCG levels is just a vanishing twin or something...
oh yeah, and the dizziness is normal. Prog. makes you feel pregnant.
I was on crinone which is made to be taken as a suppository, but I have seen many other people say they are on the pills taken vaginally.
My dr (for a completely different reason) had me take estrogen that way. My estrogen actually tested higher when I took it vaginally than it did when I took it orally, so I would bet that would apply to progesterone also.
best of luck to you..
By the way, the bleeding did stop and hubby put me on bedrest. No picking up our other children or cleaning or ANYTHING! That helped a ton. Not to mention the progesterone pills make me feel really weird and dizzy.