Baby measuring small

kema

So this Tuesday I would have turned 12 weeks based off of my last period. However I went in for a sonogram and the lady asked me if I was sure about my last period because baby is measuring smaller. What does that mean? I am super worried, this is my third child and has never happened with the others. I go back for a sonogram next week Tuesday.

Follow up:

So I had my appointment today and baby is measuring at 12 weeks which mean baby is just a week behind. Heart rate was 158. Everything look ok with baby .😊