I am 7 weeks preggo and my hcg was 26000 on Sat, and 28000 today (mon) my doc thinks I will MC...opinions?

So, I am waiting to find a doc that will treat me....I have Lupus ( high risk) and am 7 weeks pregnant. My last ultrasound showed a sac but no fetus. My HCG was 26000 on Sat night and 28000 this monday morning. I had cramping but no blood. The doc thinks I am going to MC and said I should schedule a DNC. I CANT do that till I know for SURE that this is not going to work out. It's a mental thing for me, unless I know there is NO hope. Otherwise I will always wonder. Is there anyone who has had a similar situation good or bad, I would like to have some opinions. Meanwhile I am just dying to know what the heck is going on.... :( Sad and worried in Maine....