Please let me know if this isn't the right topic and I will ask to move it.
I have 2DC (4&2) and H and I are considering a 3rd but I would like some objective opinions about whether our circumstances would make it a good decision. Feelings often override facts about things like this, hence wanting objective opinions 
So, we have a 3 bedroom house and we won't be getting a 4, ever, for a few reasons (financial, logistics etc). This would mean that one of our current DC would have to eventually share their room. They actually share right now but it's different when they're older (we have one of each), and I suppose whatever gender the third baby would be would determine who shares. I know sharing isn't the end of the world at all, but the bedrooms in our house are small (we are lucky to have a big living room and two toilets, plus our kitchen is an okay size). To give context, we're in the second biggest room as the DC have the biggest room upstairs (3rd bedroom is downstairs and small) and we can fit in a bed, wardrobe and a chest of drawers with a tv on top. The biggest room which would be the 'sharing' room, would fit two single beds in there, a chest of drawers, a wardrobe and not much more. We do have a massive living room, but I'm aware that when they're older, they'll spend more time upstairs. I'm not only basing my decision on bedrooms by the way, it's just to show our range of circumstances.
Financially, we're okay, in the sense that we have enough to enjoy a little but we don't have any savings thanks to Covid. We don't have a fancy car or holidays abroad (even without the pandemic), so we worked out that we could start saving from October this year if things get back on track for us financially. If I were to have another, we have thought that 14-18 months from now would be the time we would do it, as I would rather have all of the young years done and dusted as opposed to starting afresh.
That leads me to my next point; the young years. With DC1, I really enjoyed it, but they were so easy, whereas with DC2 I struggled a lot as they're VERY difficult and I still struggle; I don't felt like I 'lived' most of those younger days, rather survived. They're still very hard now and the thought of going through that again makes me want to cry.
Regarding the finances, for those who know first hand, does it dramatically change from 2-3 children? We gave everything of ours away so we would need to start again in terms of baby clothes/equipment. Not that it has to be extremely expensive, I would do it on the cheap knowing what I know now.
I suppose we want another DC out of instinct and, to be honest, just wanting another. Above I've listed my biggest concerns, if anyone could give me some insight from their perspective, I'd be very grateful