Hurting

Went in for 7 week ultrasound and my doctor said that there was no fetal pole or heartbeat, but a big yolk sac. They told me to dnc because it wouldn't be a healthy baby... But in my heart I don't believe that. They keep telling me aborting is my only option. I feel fine (sick and pregnant but fine) and I have had absolutely no spotting and only light cramps... I need your ladies opinions and help and maybe you know someone this happened too.. I don't want to loose this baby if not naturally. I just don't believe them..