How long after bleeding did it take for your hcg levels to drop?

I received my first vvfl on Sunday at approximately 13 dpo and began spotting that evening just assumed it was implantation bleeding but continued testing to verify. Wednesday afternoon (16dpo) it increased to a bright red light flow which lasted 2.5 days as a light - md flow with minimal clots, very different from my usually md-hv clot filled period. However my at home tests have continued to get darker every day....so confused.

I had labs done Thursday (17dpo) my hcg was 79 and progesterone was only 5. I do my second draw today to confirm chemical/loss.

Just wondering how long it took others hcg to drop. We’ve been trying for baby #2 for about 2 years now and don’t want to wait to long to start trying again.