I agree with Willow Sarah. Progesterone should peak at 7 days past ovulation. If pregnancy doesn't occur the level slowly drops and then you get your period. At 9dpo you will still get a good idea but the progesterone will be on the decline slightly and at 6dpo it will almost be at it's peak. Ensure that YOU write on the path form your ovulation date so that it's not confused. Your obs will be able to deduce what he needs to from that.

Most path labs will have a clinic open on a Saturday or later in the evening too Sarah. I would phone the pathology company and ask.