You can still be working toward a degree now, on a part-time basis. My cousin started with an associates in nursing and eventually became a registered nurse, then a certified nurse practitioner, with her own clinic with a partner. All while raising 2 kids.
I am a veterinarian, which takes 7 to 8 years of schooling - undergrad/bachelor's, followed by 4 years of veterinary school. I went straight to college after high school and got my education first before getting married, but there were many students in my vet school class who were married with young kids. One was 44 when she started vet school with a 12 year old son! She had already been a lab technician for several years before that so her undergrad education was already out of the way. Becoming a veterinary technician is another option and it takes less time to complete the program.
A friend of mine that I grew up is a mostly SAHM with 5 daughters (including twins and a newborn!) and she works part-time as a yoga and fitness instructor.