Low hcg?

I got a positive pregnancy test on monday at 12 days late. I had tested the Friday before and it was negative. So I got a really late BFP. I went to my OB and they did blood work. My hcg was 43. I went back today and it was 96 which is good because it is doubling. The nurse and dr. didn’t seem concerned and said to come back next Wednesday for another test.

Odds are I ovulated really late and I’m closer to 4-5 weeks. But are the numbers okay? I’m just worried they are too low.

If it’s suppose to double every two days, what should it be next Wednesday?

Thanks in advance!