MG - i would recommend if you can get your hands on one,, getting a plastic backed "kitty"?? not sure if that is the name you know them by,, but they are used in hospitals etc and are just plastic backed padded sheet type things used to go under patients,,,,, try having one of those on your car seat folded to fit that is,or have a towel with a plastic sheet or even a thick hefty bag over your seat upholstery with a coule of folded towel on top, then your car is safe,,,,, as for the bed,,,, (and i know this is gonna sound wierd) but get yourself a shower curtain,, and lay it under your sheets on your bed,, so if it does happen in the middle of the night,, your mattress is safe as well. As for your carpet,, unless you have scotchguarded it,, then all i can say is pray like all heck that you miss that lol.
I was really lucky,,, the only pregnancy where my water broke was my first. At 28 weeks when i was on the loo at my inlaws house,, my DS gave one HUGE almight kick,, right when i was about to stand up and pull up my knickers,, and my waters broke all IN their loo lol. They were very grateful that it did not happen on their carpets lol.