Since I think Friday night I have been getting cramps, sometimes very bad, sometimes barely at all but with no period. But last night they were so bad i felt like throwing up and they kept me up all night, and they were bad in school today all day. For the past few months ive been getting my period on either the 15th or 16th of the month and I will usually get cramps the day before I get it. This time is different though. Could this just be because ive only had my period for a year and a half and its still irregular, or is it something else? Its kinda scaring me.