Due date a week later

Anna • Fri, Sep 20 • 🤰🏻04/15

I went to my second ultrasound two days ago at 10 weeks and the doctor said my baby’s only 2cm long so I’m a week behind, at around 9 weeks. That kinda bummed me out. He told me it isn’t a problem and that the baby isn’t maturing slowly, instead I might have ovulated later. Has anyone had the same experience?