ok, deep breath as I am trying really hard to keep calm over this. Sorry its a bit convoluted. 
For various reasons (living abroad) I booked into the NHS system at 34 weeks pregnant. Was told on the phone that this was the only way to do it and would all be fine. So, I had a booking in appointment at the hospital at 35 weeks, with lovely midwife who did bloods, tests etc and said all was well, but that I should be seen weekly from then on. Since then, its been ridiculous - I keep getting letters and phone calls from a centralised booking system, offering me appointments two weeks after my due dates, and letters offering me check ups, that arrive days after the appointments are scheduled. Each time I manage to get hold of a midwife, she is very sympathetic, but says she can't do anything outside this system.
I haven't had a check up for a fortnight, and although I've had a good pregnancy so far, I am really worried that something will go wrong at the last moment because I'm not being looked at. I have a family friend who is a obstetrician who has offered to check me, but I'd rather not ask unless I have to. Any ideas how long I can leave it without a check up? And what danger things should I look out for?
At the very least they've told me I can go into hospital if I'm in labour! Which is kind of them!