Anyone measure a week behind?

Jaylene

I had my first early scan on monday Feb 15th. We saw our little bean and the heartbeat was 119.🥰🥰 I was supposed to be 7 + 4 but baby measured 6+4. They want me to come back this Monday the 22nd to make sure baby is growing and going good they said because of my history. I'm just a little nervous. Is 1 week behind something to be terribly worried about? My edd went from sept 30th to oct 7th.