Suggest Treatment For Abdominal Pain,nausea And Headache

Hi, I have had unprotected sex three weeks ago soon to be a full month this upcoming thursday the 10th, I was supposed to get my period on the 6th I know its still early but I have been experiencing things I've never experienced before with my period. I have lower abdominal pain back pain leg pain nausea headaches and swollen tender breasts what should I do?