can someone help me please....

hi all, I have my 20 week scan next week at the hospital as normal.. Been booked for weeks and weeks.... but I get a message from the NHS advising I have an appointment this Thursday... so I call them up and they advise it's just a routine check up with the doctor at the hospital. 2 weeks ago I met with my midwife and all bloods etc came back fine... I never booked this hospital appointment in. has anyone else had this at all? just a random routine checkup with a hospital doctor rather than their midwife?... feeling really anxious and confused about it... this is my first baby x