Are you used to wearing sandals that are slip ons OP? I have tried in the past, but I just can't get on with them - my feet keep on slipping about, and I almost fall over in them - which is not particularly healthy, especially when youare pregnant.
The colour is fine as it will go with almost everything, and as a pp said, if you do where these, wear them with lovely painted toenails, and maybe an ankle chain if your ankles haven't swollen too much!
However, I don't think that the heel, and sole look very comfortable, as they don't look very supple or flexible, so if you are going to be walking in them a lot, then I don't think that these ones are the best choice.