Can you determine low progesterone

Sierra

Last cycle was the first cycle I started BBT testing. I was looking back at my chart and thought it was odd that my temp started to fall so early when everything I read says it should fall a day or two before AF is due. On my chart it started to fall at 8DPO. Could this be a sign of low progesterone or am I just reading too much into it?

Also yes I am using fertility friend this cycle and I started testing from CD1 😂 it's so much easier to use.

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