it just comes randomly. lastes just a few seconds (5 at most) its happened about 4 times tonight in the past 3 hours... what could this be? it really hurts and then its gone and dosint hurt anymore. i just need to know if this is something i should worry about, have you ever had this? or heard of it? what should i do?

if it keeps up i will go to the dr omorrow
its not like cramps or anything...
never had this before with my period..