Pregnancy surprise to husband!! Now 5 weeks and no sac in ultrasound.

Hi Everyone!!

I’m pregnant and told my husband the news a few days ago!

I’m 5 weeks. Started spotting. Cramping and sharp stabbing cramping for 4 days now.

Went to Kaiser and they did an ultrasound and cant find the sac. They said to wait a few days and go back.

Is this normal? Blood test shows hgc test at 534.