CD24 Progesterone Test question

Ca
Can the Progesterone blood test (to check if ovulation occurred) show any levels of hCG or anything that would show pregnancy being successful? If blood tests are more accurate than hpt, then at around 7dpo, wouldn't a blood test show something? I know a typical doctors response would be "we're not looking at hCG levels for a Progesterone test"... but I'm curious lol
I'm on first round of letrozole 2.5 mg for CD5-9. I'm on CD16 now and haven't ovulated yet... getting anxious lol