What Causes Itching In Nipples With Headaches And Lower Back Ache?

I had sex while on my period last month. I though that I might have gotten pregnant because about a week and a half before my period I began feeling nauseous, extremely tired, had headaches everyday, gassy, loss of appetite, tender breast, cramping. My period ended up being four days late and was extremely light. Now that my period is over my breast aren't tender anymore but they itch and my nipples are morw sensitive than normal. I am still having headaches, cramps, lower back pain and frequent urination at night, with occasional indigestion and nausea. I found out
On Friday that I have chlamydia and have been treated. Could gbis be the teasi. For the late period and my symptoms or could I be pregnant?