Your question: "hello my last period was may/29/2013. I had sex on the 06/11-12 /2013 and now I am having sever cramping pain and fatigue and headaches. plus my lower back pains. I am not plan to come on my period until the 06/28/ 2013. I must know! AM I pregnant ?"

It's way too early to tell. You will have to wait until you miss your period. If you do, wait 14 days, then test with the first urine of the morning.