No fetal pole... help please!!! 💔😢

So I went for an ultrasound and check up 2 days ago, at about 9 weeks. And there was a sac but no fetal pole. The doctor looked and looked, but nothing. He told me to do blood work to check my hcg and it went from 7,000 to only 13,000 in a 2 week span. He scheduled me for a transvaginal ultrasound but not for another 2 weeks! Should I be expecting to miscarry before I even go to that ultrasound? I don’t know what to do... I feel left in the dark with no answers and I don’t know what’s happening or what to expect. From my own research, I’m assuming it’s a blighted ovum but I don’t know cuz I’m getting no answers... please help