scared/confused

Angelica
Okay so I've been off BC since November I have not gotten pregnant. About a week  ago I started working out and yesterday out of the nowhere my lower abdomin was cramping really bad! I am
Not expecting a period for 2more weeks!  So I was at first thinking I was just sore from my workout but the cramping went on all day! And my mood completely shifted! I wanted to know if anyone experienced anything like this before?