Anyone going through a miscarriage

I don't really have any one to talk to about this- I'm 32 and pregnant with number 2 but my ultrasound was not good news. I should be 9 wks but I'm measuring at 6 and bleeding and my symptoms are pretty much gone. I don't know how to feel as my doctor was still hopeful but I don't feel hopeful at all. I think I'm going to miscarry And i don't know how to do that. Or what that feels like. Will i start gushing blood. Will I keel over cramping. Or will it be like a period as I'm not that far a long? How do I know if something's wrong. My ob is great and I know I can ask her but She's very medical and professional with her answers. And if I do miscarry, when can we try again? Anyone have any resources or want to share their experience? Thanks. Good luck to all. Wishing everyone sticky baby dust.