Congratulations! Ime the first trip to the doctor is quite underwhelming, mine didn't really do anything apart from congratulate me and run through a quick list of dos and don'ts. In my area you book in with the mw directly but some places your gp will refer you. I didn't bother going to the gp with dc2.
Yes I have to second it being a bit of a none event. When I had mine he took my blood pressure, asked if I smoke, asked if I'm taking folic acid & then to me to leave a sample with the receptionist on my way out. The receptionist then booked me in for a midwife appt a few weeks later. Whole appt was less than 5 mins!