I’ve seen different people throughout my pregnancy so it’s not guarantee you get a named midwife I don’t believe. They may for example be off sick or have other circumstances that have meant they haven’t been on duty to see you on the day of your appointment. As long as someone is reviewing your notes prior to each appt I honestly wouldn’t worry xx
Had my booking appointment at 8 weeks. Next appointment wasn't until 16 weeks. I've now had that one and won't be seen by midwife again until 24 weeks. At which point the appointments become a lot more frequent, like every 3-4 weeks. It may become mroe frequent if any risk factors develop like gestation diabetes. Sounds like you're on track for now
Also have you got the badger notes app? Its where your pregnancy notes get stored and can help you get your results a bit more promptly after your appointments
Had a midwife appointment at 10 weeks (booking appointment) and 15 weeks (appointment 2) then there will be numerous other appointments in the future with her.