Mine was first tested at 13dpo at 18, i then went on 800mg of progesterone daily, and at 15dpo it was 30, 17dpo 45, 20dpo 65 I'm still on 800mg a day and will start weaning off this week over the next few weeks.
The notes i made at the time in my diary say normal first trimester progesterone is 9-47, my OB said nudging them higher is covering out selves as there is no way a normal dose can take you too high... she didn't give a me a figure for that though.
I really sounds to me like they are just covering you to be extra careful.
My Progesterone levels for 5weeks 6 days were 27.4. The nurse at my clinic said they were OK. I was already on 2x 400mg pessaries per day.
I had to add another pessary to the mix making it 3x 400mg per day and I had another BT 3 days later at 6 weeks 1 day and my progesterone had jumped up to 37.4. So it had increased by 10.
I hope that helps. We did a 5 day FET on Prednisone, Progynova & Provera.
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