@Gymnastxo96 there are a lot of issues here, aren't there?
Your IUD isn't going to stop you getting pregnant when you're ready to have children, but it is protecting you from having children before you're ready. Being able to care for yourself independently is ideal before you commit to being responsible for the life of a baby.
Your posts here use very simple language, so I'm inclined to believe, or at least not surprised that you have been assessed as having a relatively low IQ. One of my daughters has a low IQ and uses far more extensive language (but rarely really understands it).
The adaptive IQ being so low will be because of your autism, but it doesn't mean you've been misdiagnosed. The whole point of autism is that adapting to change and reacting to different circumstances is hard, which is what adaptive IQ explores.
Adaptive IQ is important because it means that you are more vulnerable in daily life, where unpredictable things happen. It's really key when you're thinking of having a baby at some point because they really don't do things in an orderly manner and if you can't cope with responding to their needs in the moment, they are likely to be neglected at points in the day.
It sounds like your Mum is trying to help you and keep you safe? Are you finding it hard to trust that she's got your best interests in mind?