Smaller baby- 7 weeks

Went to the ER last night due to some spotting (I’ve had 2 m/cs last year) we did an ultrasound and got to see our little nugget. I’m supposed to be 7 weeks today, baby was measuring at 2mm, but we got to see a heartbeat and was measuring at 96 bpm.

She said baby was extremely new and small so am I not as far along as I thought? Or is baby not growing like he/she should be? Has anyone else measured small and went on to have a healthy baby?

We seen baby, heartbeat, and fetal pole. My last period started January 13, and I have 33 day cycles.