Gestational sac empty.

Am

Hi, I just had an ultrasound done today and my sac was empty. She said she mightve seen something small but wouldn't tell me what it was. I am guesstimating I'm 7wks. My last period was May 13. I recently had a miscarriage in January, I was suppose to be 10wks but the lil one died in 5wks. 😥😥😥. She told me my dates could be off, but at 5wks I could see the lil one, it just didn't attach. We may just have to try again.😥😥😥😥