I was a SAHP for 4.5 years and then worked a job share doing 2 days a week and have literally this week gone back to work nearly full time.
My dc are 9 (year 5) and 6 ( year1).
When the DC were little I absolutely felt like I wanted to be at home and it felt like the right choice. DH changed jobs and he got a massive payrise, we could afford to move and times were good.
Then a job share came along as ds started reception and it would have been crazy to turn it down.
DD started reception in sept 2019 and I just felt a bit of shift in DH's attitude towards me. Comments like wasn't I lucky going to play tennis (which I was), meeting friends etc. I stopped talking what I was doing as I felt guilty.
Also in the last 10 years DH hasn't really had a payrise. All our costs have gone up and we have just stagnated financially. We never thought we'd still be in the same house and were becoming more and more disheartened over finances.
Anyway since my new job was agreed dhbhas really opened up about how he's been feeling really stressed about money feeling like the responsibility is all on him etc and I have noticed a shift in his attitude again in a positive way.
I definitely think you need to sit down and discuss with you DH how he feels.