Feeling torn

I've been having back pain and pain in both knees and we've been trying to conceive our 1st too. I'm 34 years old, I want to be able to enjoy raising a child while I'm still kinda able to. Please don't judge me for wanting a baby while I'm dealing with this pain. I do worry about how am I supposed to take care of a child if I'm in pain almost 24/7. It'll take me months to recover from having surgery on my left knee so I won't be able to try to conceive while I recover. If I hold off on the surgery and get pregnant I'll be dealing with more pain. I'm crying because I really want to be a mom and I don't want to be in pain anymore.