Gestational sac but nothing inside it 😰 PLEASE HELP !

Bri

I went to the E.R. just to confirm pregnancy since I don't have insurance yet...I was 4 weeks & 5 days at the time & they did the normal ultrasound & a vaginal ultrasound. But there was only a sac visible the doctor told me that it's normal being that I'm so early. My question is have any of you ladies been through this same situation & if so how long did it take before baby was visible ? Thank you so much any helpful responses are appreciated !