When to call Dr for progesterone check

I had 2 mmc and a chemical pregnancy in a row. Dr said to call when I get a positive test so we can check hcg and progesterone right away, but does that mean as soon as I get a faint positive, blazing positive or wait until after af is late a few days or due. I'm just wondering cause I seem to get my positives early like 8-10 dpo every time I'm pregnant ( been pregnant 5 times) TIA!

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