Thinking about leaving job

Have any other ladies experienced a problem with a leg being on the verge of giving out after standing 8 hours at work? I just started this job and the past few days my body has been sore, and I never had this problem before. I’m only 26 weeks, and may have to leave this job because I can’t preform it sitting down. It’s full time so I can’t cut hours. I can only imagine it’ll get worse as I get further along and into 3rd trimester. Their part time positions require help with unloading trucks and with me being pregnant and not use to that I don’t think it’ll be smart for me to move down to that position.