HCG levels during miscarriage?

Can HCG levels continue to double during a miscarriage? Like while a miscarriage is already happening? Asking because on Monday my HCG level was 33, by Wednesday (today) my HCG level was 77. But I also started bleeding on Monday and I’m still bleeding today. It’s been like a light period with light cramping, no clots or anything. But definitely red blood. Doc wants to check HCG on Monday.