I've had one waterbirth, and twice more laboured in water but not actually given birth in it. For DS1 the water got manky so I got out whilst it was changed and then when it was ready I didn't want to move so stayed where I was. For DS2 he was born in the water and it was lovely. With the twins I laboured in the water until I was pushing and could feel the baby coming fast. I had agreed not to give birth in the water for reasons which will not affect you, and TBH I don't think I lost anything by getting out at the last minute. However 2nd stage only lasted a few minutes (or at least that's what it felt like) so I wasn't pushing for ages on dry land.