EXTREME fatigue, light cramping...any ideas?!

I usually cramp a little during ovulation but I kept cramping right up to my period. I have also had terrible gas pains, (sorry if tmi) but most of all I have been EXTREMELY tired all the time! my period seemed normal it ended on the 12th and the exhaustion has yet to stop and my nipples are still sore! Ive never had a period w/any of my kids but I just don't understand what is going on. Have any of you experienced anything similar to this and been pregnant or any suggestions of what it could be? I am in the process of finding a doctor since i just moved to a new state..Thanks ladies!