Ultrasound dnt reveal anything. Stressed out

Charu

Did my first ultrasound today . HCG levels as of 2 days before were 334. Doubled from 165 in 48 hours. And im about 8 days late. However ultrasound didn’t reveal anything.The doctor could not see gsac. She says its normal and im to repeat ultrasound after a week but I’m so stressed out. Has this happened with anyone ??