What does your first appointment in the UK involve?

I haven't got my first 'booking in' midwife appointment until 22nd April at this point I will be 10 weeks. (ish) Will they leave it another 2 before booking me in for a scan? Nervous and apprehensive as haven't been given any advice or information. Anybody know any more than I do or what it fully entails? They say it can take up to 2 hours! Thanks