I'd pay a childminder/babysitter if i'm really ill (flu etc)
This^^ statement makes me think you don't know much about the practicalities of childcare.
You can't hire a childminder for a one off like being ill.
You will just have to plow through having the flu and caring for a baby that needs feeding/changing 10 times a day.
Are you having any counselling? It sounds like you have lots of issues going on. The hormonal shifts of pregnancy are likely to make your depression and anxiety worse. Also it's not ideal to be taking meds whilst pregnant.
I think the best thing for you atm is to focus on improving your mental and physical health.
You also need to look at the stability of your housing, employment and social support network.
I really can't see all this being sorted in under 3 years.
Then come back to the baby issue.
There are lots of practical things to consider-
-are you private renting? It isn't great having to move every 6 months with a child. Are you in a 1 bed? Can you afford a 2 bed once your DC is a toddler?
-what jobs are you looking for? Childcare is usually only available m-f 8-6 restricting your job options. You also need steady hours- you can't chop and change childcare every week if you have variable hours. What is the pay like in jobs you are applying for? Nurseries are c. £40 per day. Could you afford this & pay bills? Have you researched tax credits? Do the nurseries/childminders in your area have long waiting lists?
-thinking long term what is your local school like?
-do you have a car/licence? Can you get to work etc with a baby in a buggy?
-have you budgeted for baby equipment?
There is so much to consider and you have to be on top of all of this is you don't have a partner/good suppor network to fall back on.