I’m 20 weeks 6 days, I’ll be 21 weeks tomorrow

My sweetie tells me I walk like I’m already going to pop... I told him that my back and hips hurt and it’s more comfortable walking with my legs a little apart... his family and him doesn’t seem to understand, this is my first pregnancy... they think I shouldn’t be “complaining” but I told him it’s not my belly that hurt it’s my back, I try to stretch as much as I can but considering I work standing it doesn’t help at all I sit when I can ( I am an RDA and I work at a dental office) because of work I feel like my back has got more stif... 7.5-8 hour shift I get my 2 10 min break and my hour lunch and when I assist or do my RDA duties I do sit... I also move really slow at work now

Has anyone’s back, hip been hurting or feeling stiff...