‘You all seem to completely ignore the fact that I keep telling you all “my colleagues have literally told me that they would rather be in the office than wfh”.
That’s all 79 colleagues in your Dept is it? You’ve spoken to each one and they’ve all told you that?
Quite frankly, given the stresses of even trying to get into work right now, given that some of them may have to use public transport, or walk a long distance, plus inevitably touching door handles, Office equipment Etc
You all seem to completely ignore the fact that I keep telling you all “my colleagues have literally told me that they would rather be in the office than wfh”.
What- all 79 other people from your office have told you that? 
Quite frankly, getting into work involves any number of stresses right now- public transport/ walking a long distance/ touching door handles, office equipment etc... I find it hard to believe that everyone else happily carried on in the office while you were given the preferential treatment of a laptop to wfh before anyone else
I understand perfectly what discrimination is, and tbh I can’t see how you think your employer is discriminating at all. They’ve bent over backwards to accommodate you, first by allowing you to wfh while others didn’t have that option, and now allowing you special leave for a month so that you don’t have to do what everyone else is doing, one day a week in the office.
Meanwhile, you seem to gloss over the fact your dh’s employer sounds as though they are discriminating, and you seem to assume that your employer should almost ‘step up’ to allow for the fact that your dh’s employer sounds a bit rubbish. That sounds to me like a classic case of a woman making the assumption that the father can’t be expected to take equal responsibility for children.
Of course it’s not about treating everyone exactly the same- the number of patronising posts pointing that out and assuming the rest of us don’t know what discrimination is, is a tad wearisome.
The fact is: you haven’t been treated the same. You were given special treatment at the start, being able to wfh when others weren’t. You’re being given adjustments for the next month to enable you to not have to do the same as your colleagues.
No employer can be expected to let a specific set of adjustments run indefinitely. It’s entirely reasonable that you use annual leave if you aren’t going to be going in one day a week by july or whenever the special leave they’re giving you is up. That’s what your colleagues will have to do if they’re unable to go in, or feel unable due to the issues around getting into work.
Realistically, this is probably hypothetical anyway because some childcare may well have opened up by then to accommodate your needs, or lockdown will have eased enough that you can make other arrangements.
But honestly, Im all for supporting women in the workplace and have personally bent over backwards a number of times when recruiting people to my team to encourage mothers back into the workforce. But I can’t see what your employer is doing wrong here. Are you sure it’s not just sour grapes because your colleagues had time at home not working? That’s a bit ridiculous because they could have been going stir crazy for all you know, and would have opted for a laptop provided by work and a job to get on with if they’d been given that choice from the start