am I the only one ? 🙄

I'll be 39 weeks on Monday I've gained a total of 40 pounds as of Tuesday this whole pregnancy so far which the doc still says my weight looks perfect I was pretty small before pregnancy but lately my hips & knees have been pretty sore & aching all the time which I figured was pretty normal at first but now just recently if I stand to long or just stand up sometimes they will give out on me & I'll stumble 😔 I've only actually fell 1 time cause of it but fell on my knees & was okay I go back to the doctors Tuesday & definitely plan on mentioning it to them but just wanna know if that's happened to anyone else ? Could it just be the extra weight I have or maybe baby is on a nerve when it happens ? Idk but it's scary sometimes not knowing when it'll happen .