Low progesterone? 8.0 at 5 weeks

Be
So I just got my labs (through and online portal) my HCG as of last week was 2301 and my progesterone was 8.0 (the write up said it was within normal range but it's not, I'm confused) anyhow been spotting brown blood after wiping for the last 5 days. I feel so worried, any idea what this might be? Is it a sign of miscarriage? 😔