I am taking progesterone injections for an ivf procedure. Since I've started, I've noticed I have continued pain on my right hip after an intramuscular injection in my upper rear-end. The pain shoots down right above my knee. Then the pain remains there for several days in my upper side hip. I've also noticed that two areas are now super sensitive. Like a raw sunburn. I never have any problems with an injection on my left side. Only my right. I've injected two times on my right side, and get the same results every time. Why is this happening?