I don't know where to put this, feel free to move it!

Long story short: I'm pregnant, bleeding and my ob is convinced it's a miscarriage and wants me to have a d&c although my # are still going up.
Has anyone experience with this? Any advice?

Long story:
before DS my cycles were exactly 29 days. Now PP they are all over the place. This cycle I got almost positive opks at around cd 8/9 and positives on cd 28/29 I tested 9 dpo and 10dpo and got very faint positives at 11 dpo I got a positive on a digital and I keep getting positive lines ever since (and they keep getting darker)
On cd 31 I started bleeding. At first I thought I was out, but the bleeding stopped and I tested again, positive. I started bleeding again that evening and since then I'm bleeding on and of for 5 days. I went to see my ob wednesday (cd 42) and she told me I'm miscarrying and that, due to the hcg levels I'm at least 5-6 weeks. She believes I'm still having 29 day cycles.... I know I cannot be 5-6 weeks. It's not possible. But she insists. I went in for beta yesterday and it went up again. Now I need to come in and check on monday if I'm miscarrying naturally or need a d&c. My ob really wanted me to go right away to have it, but I insisted on waiting... I took a hpt again today and it's still getting a lot darker. I think it's not a miscarriage, it's either a chemical or a different kind of bleeding. I also found out that I start to bleed when I carry DS or carry something else around and it stops when I sit or lay down.
I'm a little scared to see the ob on monday. I think maybe I should trust her, but then again I just don't. Has anyone experience with something like this? Any advice?