Horrible area is an interesting one and one its important to put in perspective and soon.
What is it that makes you feel the area is horrid? Is it the lack of shop, that you don't know people, that you are unfamiliar with it?
Have there been actual crimes and real risks to you going out in the area since you've moved in?
The reason I ask is because of something in my past sometimes I become intimidated at the prospect of going out. I make what are plausible excuses to excuse my behaviour to myself, the fact they are not actually fact based is not relevant to my mind. It can become a vicious circle that is very self defeating.
Is there a medical reason that over time you couldn't learn to drive so that there is long term hope of increased mobility where ever you live longterm? What are the public transport systems like by you? What about occasional taxis - a once a week trip to browse baby stuff (even if its just window shopping) in a town? Alternatively could your DH drop you to town one day a week and you taxi/ bus back?
The most important thing I find is not to let the house become a self imposed prison.
Have you joined any pregnancy groups? Many people find life long friends at these. Not every group is for every person but your midwife should be able to let you know what's in the area, they may even introduce you to someone nearby who could give you a lift if you explain the situation.
If your husband works near where you live and your mum is 2+ hours away, neither of you drive what is the realistic chance of finding yourself in a property in walking distance of your mum?
Do you have space that your mum/ a sibling/ a good friend could stay for a week or two to go to groups with you the first time and walk the dog with you to build your confidence that firstly you can do it and secondly that it isn't so scary?