Lower right back pain right above my butt. if i move the wrong way or put pressure on my right leg. help?

Back pain: It could be arising from the sacro-iliac joint or the hip joint. Si joint pain usually radiates up to the knee. A fall on the buttocks is a common precursor. Regular low impact exercises would help. Warm compresses, Ibuprofen or topical creams would help as well. A pain physician can properly evaluate and manage it with various modalities.