I also have numbness and a shooting pain in my leg. Could it be sciatica?
I teach secondary school, 11-18, in quite a challenging school. Is a TA like a classroom assistant? I worry that it is the standing on my feet all day at work and often not having time for much of a break that has caused this.
It probably is since there's numbness and it's going down your leg. The baby might be sitting all of the weight on your nerve. Usually medicine like Tylenol doesn't do anything for it since it's nerve pain. I use hot packs/warming blankets on the back/hip to help. (if you don't have one, find a clean sock and put uncooked rice inside. Heat the sock with the rice in a microwave for 1 minute, instant hot pack.) But make sure it's not too hot, just warm. I would ask your doctor about maybe seeing a chiropractor or suggestions for pregnancy stretches.
My husband would aide me in a laying (lying?) down stretch to help pop my hip/pelvis and it would alleviate the pain. I would definitely ask the doctor or even call to ask the nurse desk.
Ah secondary, that might require a TA (Teacher's Assistant). Hopefully, there are some volunteers/interns getting certified that could help you. If not, maybe try planning a list of activities for the day that encompasses the lessons. It keeps them all busy without losing too much time with the material. I would consider using a powerpoint/projector if you have access so you can sit down while working. And if you can commandeer a rolling chair, that's even better. I used that to roll around the classroom without getting up. You can even put a cushiony pillow to help ease any back pain.
Hopefully, some of this can help