Congratulations on your new house!
I can't give you any numbers as of right now, as my bf and I are currently looking into either to buy a new house together or to take out a mortgage to do huge renovations in the house that my bf bought years ago (by himself). With all the fees that come up during the process, it seems like it will eat up all of our current savings and we would be left with maybe 2-3k remaining (depending on how much we can save up until then, currently we have enough to pay all the fees which are ridiculously high (10-15k).
About your situation, are you splitting everything 50/50 or is more proportionate based on your incomes? Is there a chance for you to potentially earn more in a few years time? It can also be a smart move to pay more on top of your mortgage at the beginning (maybe first 5-10yrs) since a lot of it goes towards interest % and less towards the house loan repayment. After some years it evens out, but doing this can shorten your mortgage by several years in the long run.
If you decide to have children, they're going to be another huge expense which makes it even more difficult to save money.
Also there's a lot of hidden costs associated with owning a house such as maintenance, or issues occurring throughout the years of living there. What if the washing machine or fridge breaks down? Calling a plumber or an electrician in can also be annoyingly expensive (not to mention takes forever to find one). All these little things add up over time and it sucks if you're not prepared 😂
I've been in similar situations before (and partly still am) that I feel a little inferior or insecure due to earning less. But for me it helped switching jobs/career and dividing our expenses more proportionately. But I'm terrified for when the kids are going into the picture because the stories are true: kids (and childcare) are expensive af and single-income families are generally a thing of the past due to the costs of living.