Op I say this really kindly as someone who is probably neurodiverse but on the milder side (mine is more Inattention, anxiety and stress related with organising everyday tasks and socialisation.. So auadhd). Having a baby probably isn't the best decision for you.
You don't have your own place, so of course your mum doesn't want to be landed with caring for a baby. You seem to be hyperfixating on having your iud out but now is clearly not the right time.
I have my second born in my lap right now and let me tell you it's bloody hard, even for someone who is neurotypical. I didn't cope very well with my first, I got no sleep and I need sleep to function, I had a traumatic first labour and just fought constantly with my partner. I wish I could go back now that I have learned how to deal better with the stress, but that is not possible. For someone who is autistic with a lower IQ they might not be able to cope at all with this or unintentionally neglect the baby.
I say this as someone who is barely on the spectrum and has a job and owns my own home, parenting is not for everyone and will be especially hard for someone who doesn't cope well with change. I had to learn coping strategies to cope with my baby being a baby, in the future my sons meltdowns. Oh yes did i forget to mention he's basically a mini me, demand avoidant, Ocd, anxious and doesn't cope well with change, so bare in mind your child is likely to inherit your problems and you will have to raise them to be a responsible adult or be their carer.
Luckily I adapt to change, I just take a lot longer so the second one has been easier.. But as I said it's very hard.
Please don't look at having a baby with rose tinted glasses, they are not a novelty, they are not like having a pet or a dolly, they grow up and can be little bastards (my son hits, kicks and bites during the worst meltdowns).
Just think about getting yourself in a better place first one step at a time, living independently should be your first step.