First ultrasound showed 5 wk, 2 days

Mei

Kaiser scheduled my ultrasound for today since I’ve had 3 miscarriages. I showed up to my appointment only to be told that I am actually 5 wks 2 days and she could only see a sac. So now I have to go back in two weeks to see if there’s a heartbeat and fetal pole. I’m not sure how I should feel?! Did this happen to you ? Is this common?