I have a small driveway/parking space in front of my house. Earlier this year I bought a parking permit for my car (as the road is meter parking/residents permits) because it would mean my visitors could use my drive (it's hard to park round here).
A friend of mine got a job near my house, so I said she can use the drive whilst she work, she uses it sometimes, she pops in to say hi, she's very grateful for the parking and has done me a few favours like helping paint some rooms in my house, we're both happy.
But it's turned out some of my neighbours have also been using the parking space, including their lazy kids. I've told them before that the space is often used (though some days it's empty) and asked them not to park in it.
This morning I returned home to find someone had parked there, it's the neighbours daughter who is too lazy to look for a street parking space (which may be hard to find). I can't speak to them now as they seem to have gone shopping/for lunch (I live by the town centre). I have to go out and am heavily pregnant. As I'm likely to lose my street parking space this means I'll have to trek round looking for a space when I return 
Am I being an angry pregnant woman or should these people (and other neighbours who just park with no consent) be respecting my instructions not to use my parking space?!