How are you dealing with stress?

I'm a full time director of a preschool. So I have the children, parents, and teachers to account for. I'm have a 4 year old son and a husband that i go home to every night. Let me say that I don't usually have extra money to go take a yoga class or get a massage. My job is so draining and there's no one else that can help me with all that I have to do. I find myself getting so upset when I stress over the kids and my staff because I don't want it to affect my growing baby. I'm 26 weeks and do not want to go into preterm labor. I was a teacher with my first son and to this day loud noises makes him upset or if I yell to loud. I don't want that to be attributed to when I raised my voice with my class during pregnancy 😖😖😖