Abdominal/vaginal ultrasound question

Hi I'm over 11 weeks pregnant and the doctors office and associated midwifery that I go to strictly only does vaginal ultrasounds until week 20. Due to issues in the past I have anxiety about having a vaginal ultrasound done right now. I was just wondering if any of you have gotten an abdominal ultrasound done before week 20 or if this sounds like normal protocol? Thanks ahead of time :)