Hi LYnn,
Progesterone of 18 indicates that there was probably little or no ovulatory response. (in my opinion). It is also in my opinion probably too low to indicate pregnancy had occured However, as with all things pregnancy and babies you need to expect the unexpected.

The progesterone levels for pregnancy in the 1st trimester vary greatly from about 30-160nmol/L. With the levels rising quite steadily in the early days. When women have serial progesterone levels done after conception (but before hcg is available) you will see a steady increase in the levels. However, this doesn't always indicate pregnancy as you can have quite high levels with steep rises and not be pregnant. (I believe that Michelle had very high prog. levels in one particular cycle prior to conceiving Alf)

OKay all of that said... It could be an aberration of normal temp - you were hot, etc etc. I have had a similar experience when temping (years ago) and when I retrospectively looked at my chart I assumed environmental factors being the cause. I am not saying this is what has happened with you but it's just a thought.

I am not sure, I guess all you can do is to wait until tomorrows temp and see. I am really sorry Lynn as I know that hasn't helped at all... Email me so I can send you this lovely magical Moonstone to put in your beautiful yellow booties.