Trinity, I'm not doing loads - just sink and clothes the night before for now! It sounds like you are already doing masses anyway just keeping up with your 3, but don't have time or headspace to plan tasks in advance or write them down. I bet if you had someone watching you, you'd discover you were doing more than lots of people here anyway, you just don't feel like you're on top of things. The idea of this is to gradually, gradually, gradually start to feel like you're in control rather than just responding, but we are not expected to get there all at once - it's a process, and can be a slow one.
Once I have sink and clothes established as proper, don't-think-about-them habits (and once I'm past 1st trimester of pregnancy and have more energy) I will add in ONE more set-in-stone thing at a time. I'm taking the concept of 'baby steps' VERY seriously. I do 2 min, 5 min and 15 min sessions if I can, but most days at the moment I can't.
I do have a new strategy, which is to add a tiny bit of order wherever I am any time I can - and when I say a tiny bit, I mean a tiny bit - eg pick up ONE mouldy mug on my way to the kitchen ... I count that as a 2 min hotspot right now!! This helps as I'm not aiming to 'tidy up' the house, or even the room, just to move one thing.
And the small things help. I was SO glad I'd done sink and laid out clothes last night, when ds woke up at 6 - meant I could just stagger around 1/2 asleep, shower and get me dressed, and feed him breakfast out of a clean bowl without having to wade through the chaos - at least for that much!