Separate-Relation-60's journey

I was recently let go from my new job as a payroll administrator after just a few days. I had just transitioned from being a sixth-year high school teacher, primarily because I was looking for a role that offered more flexibility to care for my 18-month-old child. Unfortunately, during my first week, my child came down with a fever, and after a visit to the ER, I needed to take a day off to care for him. I asked my manager for this time off, but when I returned to work, I was informed that I was being let go for not being a good fit due to my absence. This experience has left me questioning the job market and whether it's common for companies to have such rigid expectations, especially for new hires. I feel frustrated and confused about how to navigate this new landscape, especially after being in the education system for so long. Has anyone else faced a similar situation?