Maternity coat - trench? Help, my bump is getting wet ...

[FrozenNorthPole]

Due to the general absence of summer here in NE England I am giving in and buying a waterproof maternity coat (due at the end of September). It is DC3 so I am the size of a small country. Can anyone recommend anywhere to look for one - I saw a great trench in Topshop but because I dithered it has of course sold out.
Any ideas would be greatly appreciated - thank you!

I have this one from new look, but they also do this one

Not waterproof though, although the blue one is made of quite sturdy cotton, so it's probably showerproof.

I like it so much I'm still wearing it, even though I don't have a bump now I think I'm getting away with it?

Oooh, thank you. Both of those are lovely!