Period post


I am sexually active and I haven't had my period in a month an a few days. My pelvis been hurting for 3 days mostly on the middle and right side it hurt so bad when I laid on my back and I got up and i went to the bathroom to pee I had a clear discharge and it was a light yellow color in it didnt smell could it be a std or is it because my body is getting back to normal cause I got off my depo in august I think?