You know what, I had some of the boxes on that list and some not (we had had a flat and sold it and were in rented looking for a hours in a new location, my parents are miles away etc), I had a very solid job, was married, and I was 32 and, intellectually, felt that it was a very good time to start having a family and not something to put off for much longer.
I was still terrified when I got the positive test. Excited but terrified. That bit is normal.
Your mum's reaction is not at all normal. Not necessarily wanting other things for you than parenthood (all parents have views on their kids' lives, they just keep quiet about most of them!) but kicking off about it and screaming about it, even voicing an opinions about it in your circumstances is too much to be honest.
You are a grown up woman in what sounds like a steady relationship. What do you want? Is your partner prepared to support you? Would it make a difference to you if you got married? Or if you had discussed concrete plan as regards buying a house at some stage, even if a few years down the line? These are sensible questions to ask yourself and your partner because having a baby does test a relationship and frankly, if you are having a baby expecting someone to support you or to take a particular path then you need to be able to talk about these things. I struggle to understand men who will encourage their partner to have a child but will say they are not ready for marriage. But honestly, life after kids is not over - it absolutely is different in that you have someone else to factor in and not a whole lot of lazy brunching for a while - but it isn't over.
If you want an abortion, that is ok too. My cousin did at a similar age to you - steady relationship, reasonable job, but she had a few more goals that she wanted to reach for herself and she knew that she needed more time to get to a place where she felt right about being a parent. She is now 35, has a 1 yo, with same partner (now DH) Pregnant again, fabulous job. She looks happy and I am sure that her decision was right for her, in the same way that at 27 (living together with now DH for a year, about to get engaged), an abortion probably wouldn't have been right for me at the same age. Whatever you decide, so it for you.