Scared the doctors are wrong

Does anyone else feel like this? In my mind I know it's over. Mylevelsaregoing up but not really doubling. I've had nothing but a small gestational sac for weeks that is not getting bigger and I'm 6.5 weeks. This is my 3rd miscarriage in the past year, but I read all these stories where they miraculously have the baby grow by week 8 or 9. I just want to do the d&c and get it over with and back to work and life, even though I prefer to do anything naturally. A part of me is always scared I'm killing my baby, that I didn't give it enough time, and a party of me just wants it over with.