Im 23 years old an Ive been on my cycle for about 5wks now.I been injecting in my but an its getting really sore an hard to inject.Someone told me to try to inject into my upper thigh,so I tried it.when I stuck it didnt hurt at at all everything went good.I woke up the next morning an could barley walk it hurt so bad is it something I did wrong, an were should I continue to inject.