Sophia - I've had to manage without my mum's support a few times when I really could have done with it, and although it makes me less sad now (I've built my own support network), I used to find it really hard.
I think that Cheerful hits the nail on the head - it's less about age and more about how set up you are in life. Are you able to support a baby - and do it without your mother's support, because it doesn't sound as if she's likely to be helpful. Is DP's family close by and supportive? Do you have other people who would rejoice in your baby - godmother, sister, aunt? Not essential, but they will help.
I'm 42. I had ds at 35 and have not been able to have another - ttc for 5 years, eventually IVF. I'm not full of age-regret, but only because DH and I didn't meet until we were 32 and if I'd had dc earlier, it would have been with the wrong person, but I would give quite a lot for a younger body right now!
All of this really depends on how young you are. If you're in your teens, I'd say take a bit more time to grieve after your mc and to get yourself a bit established in life - you have so much time to do this. If you're in your twenties, you're pretty sorted in terms of a safe, baby-friendly place to live, a good job that will give you maternity rights and a dp who can support you for a bit while you can't work, then go for it and find support from people you can rely on. xxx