need motivation!

i’m 22 weeks pregnant and yall i am struggling to stay active during this. i did pilates and yoga 5x a week before i got pregnant. the first trimester i didn’t do anything as i was so exhausted. once i started gaining my energy back, i tried prioritizing doing AT LEAST lower body pilates and yoga 3x a week. that lasted maybe 4 weeks. now i have alarms set for 4x a week just to either walk or do some type of exercise. it’s been working for the most part, but then i started working again, i work at a school so the kiddos just finished their summer break. im on my feet 6 hours a day 5 days a week and i get home and i am in pain and not even in the mood to do any type of anything. does anybody have any suggestions on how to improve my physical activity?