Please help!!!

Maira • Hi!
Yesterday I was at the ER because of my bad cough!! Well they drawn blood an my HCG level was low 300 an I'm 5 weeks 3 days pregnant so they took and ultrasound an they seen a sack but no baby they even had an ultrasound that goes up the Vigina. I'm very scare now and idk what to think they said I had to go see my OBGYN in 2 days.Any response would very appreciated I'm very nervous.