Working and going to school with 2 kids and baby?

Do any of you or have any of you been in a similar situation? I have a 10 and 7 year old and 9 weeks pregnant with my 3rd and last. I work part time weekends and 2 other days a week. I only make $10.45/ hr so naturally I want to do better for my kids and family and go back to school for an associates degree in the medical field (my mom was an RN) I’ve never been to college before because I was always a stay at home mom since the age of 20. I need some advice on whether you think this is a bad or good idea to try to juggle all of this. My husband works full time as a camera operator for pbs but his schedule is somewhat flexible. He’s at home a good bit, but also has to take overnight trips on the occasion. He makes about 50k a year and I’d love to eventually make about the same and double our income. I know about all about the medical field, having my mom working as an RN supervisor for 27 years. I know I can handle the job but the classes and working and with a new baby, it worries me. Unfortunately my parents are no longer living and my other family lives out of state. My husbands family also lives far away so we have literally zero help. If any of you have anything at all to add, I’d appreciate it. Thanks!