Advice??

Abby
I had a transvaginal ultrasound at 6 weeks and saw nothing but an empty gestational sac. The Dr said it was normal and to come back. I'm 8 weeks and 1 day and have an appointment friday. Recently my symptoms have been on and off and my breasts feel like they've shrunken slightly, but still tender and I've had really really weird dreams the past few days. This is my first pregnancy and I'm terrified of a miscarriage or blighted ovum. Anyone else had a similar situation to an empty sac at 6 weeks and symptoms coming and going and went on to have a healthy baby?