Suggestions for extreme back pain

Lala

I’m currently 18 weeks pregnant and I work at Amazon, yesterday was my first shift after being hired 2 months ago because I was waiting for my medical accommodation to be accepted for lifting restrictions and I did my full 10 hours + 30 min shift and my lower back was already killing me from walking/standing but when I woke up this morning it was on fire!!! Anybody have any suggestions on creams and back braces that have helped them it would be highly appreciated because I can’t let this stop me from working since im a single mom and have no choice but to work. TIA 💕💕