Good day Girls, I have very strong pain in my right leg, specifically …

Good day Girls, I have very strong pain in my right leg, specifically the knees are terribly painful? 30 weeks, there is compression of the sciatic nerve. Can the nerve give such pain to the knees? I can't walk much, after exertion, the legs hurt straight up and want to cry? Doctors say that nothing can be done now, it will pass when I give birth. Calcium I drink, thought maybe because of this. They prescribed ibuprofen, read on the internet and it says it's not allowed. Dolgit doesn't help? Please tell me what to do? How to ease the pain?