When you say you don't have family or friends around you, is it that you're far from home or you fear their reactions?
You probably know the old saying, "Life's what happens when we're making other plans". Unplanned, this baby nonetheless deserves of the best start in life s/he can have. It's normal to wonder if you're up to the challenge. I bet a large percentage of first time expectant women feel some degree of trepidation, however secure their circumstances. I know I did.
First of all I would make yourself an appointment with your GP ifyou are feeling increasing anxiety, this is the first step to getting help.
Secondly whether or not the father of your baby is planning to support you or opt out, you need to plan for the worst, hope for the best. If you are not supported by a network of family or friends, the sooner you make plans the better. What benefits are you entitled to, are you living somewhere suitable for bringing a baby home?
Put by little items each week, babies don't need brand new or This Season articles of clothing or equipment.
I think you should be open with the midwife when you see her so she has a clear picture of your circumstances. If you feel you are struggling, tell her.