8 weeks no heartbeat / twins ??

Michelle
Hello, 
Me again! I just had my 8 week appointment at OBGYN and we saw two sacs but did not see heartbeat. Doctor says no hope. I will wait two weeks to miscarry naturally, if nothing happens naturally I will then take the pills to get things going. Should I have another ultrasound in two weeks? Doctor did not suggest to do so. Anyone gone through something like this? Thank you