Based on your experiences can anybody think why I might have received a letter for an appointment with an obstetrics doctor after my 12 week scan 2 days ago? The consultation is for 7 days after my scan which the sonographer said looked fine, there was no other information on the letter and as far as I was aware I was under the care of my community midwife who I had my booking in appointment with and am booked to see at the 16 week appointment. I am really really worrying, I would contact my community midwife but its Saturday and they won't get back till at least Monday. Could it be about the screening results?