What could be causing this?

💗TashaTheAnimeFan💗

I’m 21+1 today and for the past 2 weeks I’ve been having lower back pain. It’d act up when I’d stand for a while or walk for a while. I’ve been cleaning and bending over and reaching for stuff and all that for a few hours a day because I’ve been helping working on finishing up my fiancé and i’s new home. I haven’t been lifting anything but I’ve been standing for up to 3 hours at a time. I am 5’1 and my ribs and lower back go out of alignment (it’s chronic and was offered PT but I can’t afford it). But this lower back pain has come to a point where I’m limping and waddling and it hurts to even take a step and I have to rest FOREVER for it to feel better and be able to go on with my day. Even then it still hurts but not at bad. And it’s also like my abdominal muscles are being strained too. Does anyone know what this could be? I’m going to my doctor soon I just was wondering if anyone else has been through pain like this and if so what was it?