Being on your feet all day, exacerbates it.
How is your work situation?
Do you have to be on your feet all day?
Can your Employer allow you to just sit more?
If you have a Doctor's note, that might help. To show your employer.
Back pain varies and per pregnancy.
Sometimes it is muscle strains, sometimes it is the sciatic nerve being pinched. Per pregnancy.
Thus, with nerve pain, it can be due to alignment or inflammation pressure on a nerve. Or just muscle strains.
Progressing pregnancy weight, also taxes the body. And can create pains. The ligaments also changes.
Try just staying off your feet when you are home.
Get Hubby to help with the house.
You don't want to strain yourself, and then get contractions.
Stay hydrated as well. Drink lots of water.
Try talking with your OB/GYN about it.
I'm sure this happens a lot.