@christine7788 When my wife told her employer she was pregnant with our first child, she was let go shortly afterwards.
My wife earned about 30% more than me at the time. Nothing made a dent in our finances more than losing her income. Also, it was during the GFC and my work was also laying off people every week. I am very thankful I managed to hold on to my job but it was quite stressful until I found another more secure position about 6 months after my eldest was born.
Knowing that you've suddenly become the sole income earner and that you're about to have another person to pay for was a slap in the face, but we got there. Hard, serious budgeting for a while. Luxuries went from overseas holidays to eating out at the pub once every 6 weeks or so. We learned how to make the most of all the free stuff out there. Using the library instead of buying books. Pirating instead of renting videos (yes, blockbuster was still around in 2008). Making do with one cheap car. And not being too proud to accept "gifts" (charity) from my parents when our fridge died or our car needed repairs.
Also, I got much more creative about income sources. My wife also discovered she's quite a natural at trading, and she's used that to supplement our income ever since.
All I can say is that you do adjust and that it will not be hard forever.