So confused.... a little tmi

So from the day I have had sex (2nd August)i have had very sore cramps, nausea with a little vomitting, stringy to egg white discharge, backaches, sore breasts and an increased loss of appetite. Went to the doctor last night and they did a hpt and it was negative, they also did a UTI check also negative. They didn’t do bloods but I have no idea what is going on. My period is due on Wednesday. Please anyone help me!!!