Maternity trousers = no good!
I got two pairs of maternity trousers, one from New Look and one from Debenhams. Both are completely rubbish at actually doing anything with my bump, which is what they are meant to do, they both just fall down over the bump, but fit nicely in the leg.
To be honest, I'm 38 weeks and I'm still wearing my normal jeans, except I don't button or zip them up, I wear a belt to hold them up and a bump band to cover this fact
As for tops, I am just wearing floaty tops or band t-shirts and at times I am cheeky enough to wear my normal size 10 or 12 t-shirts as they are quite stretchy!
In the past week or so I've started to wear sweat bottoms as they are just much more comfy than jeans.
There's no right or wrong, just wear whatever feels most comfortable to you.