I had to ask for reduction in my hours cause of the same thing. I'm also carrying a lot of extra fluid so it's putting more pressure on my uterus. But I can't be on my feet for more then 5 hrs without being miserable and in so much pain. Hope you work, works with you!

that's how I was with my job n pain everyday from standing up for so long no I'm 31 weeks n I'm on maternity leave couldn't do it no more but If u still wanna work u ask for shorter hours r get a doctor statement

Ask for a reduction in hours, and if your cervix is still closed you should be okay. It's really up to your doctor, just don't stress your body out too much. Maybe work 5hr shifts instead?