I think you are overthinking what were originally well-reasoned decisions. What about dad-guilt? Dad isnt just a blob for you to direct, if dad wanted to do things differently he could have stood up and questioned your decisions.
You wanted examples of mum-guilt. I will give you my gran's example. Gran's only dd (my mum) was born just before WW2 so no siblings as originally hoped for and planned. Dad was killed in the war along with his brother, and their mum had a nervous breakdown and refused to see my gran or mum ever again.
Meanwhile my gran was broke. There wasnt enough to eat. My mum had awful food intolerances which Gran never noticed (a sickly, bereaved child who complained a lot was told to buck up, and not helped or comforted). My mum worked in gran's shop after school from a young age, and got little attention. Gran remarried and had a son. As her dd grew up she became a talented artist and won a scholarship to a fine art college which she secretly applied to. But she had already been was forced to leave school at 14 to earn her own living, and my gran refused to support her - took all her earnings and made her wash her hair in washing up liquid etc to save money. So mums college plan was scorched. A few years later, gran and mum's stepdad found the money to put their son through university for 3 years at which point mum married, and left home.
She forgave my gran for her childhood. Theystill loved each other very much. In her later years, my gran depended on my mum's care for about 2 decades while she was in poor health and housebound. This was also a time of many trials.
My gran didnt overtly suffer any mum guilt, despite making many poor decisions and preventing my mum living the happiest possible version of her life.
Sometimes what happens, happens. You move forward being the best person you can be from that moment on, learn the lessons and show your child how to learn from mistakes and take yourself forward positively. We are all only human.