Pregnancy, Cramps, & Little Blood!

So Last Week I Missed My Period So I Figured I Would Take A Pregnancy Test Since My Periods Are Usually Normal, Test Said Positive. Been Cramping Like Crazy & This Morning Theres Little Blood But Only When I Wipe! Im Freaking Out Right Now! Can Someone Tell Me What Could Cause Me To Cramp Like Crazy (Besides Being Pregnant) & Bleed?