Midwife

(UK) ladies, I saw my midwife for the first appointment which was basically a little bit of background info and a chat. She was meant to come out to me today for the Booking appointment? She phoned saying she couldn’t make it and asked if I can go to her instead on Thursday which I don’t mind. But this is just pushing my first scan back and I’m getting really anxious as my mind won’t be at rest until I know everything is ok after the first scan. Roughly how long after the booking appointment is your scan? Any info or positive feedback is helpful! Thankyou xx