im 17 years old. me and my bf hadd intercourse may 24th. around june 23rd i hadd  my period. i usually get it around the 16th or 17th. during the month of july i havent had a period at all... i havemt really experienced any symptoms at all except myself feelingg hungry but at the same time ion really have an appeitie and when i lay on my stomache i feel like throwingg up. and been having these on again off again headaches... ion knoee whats goingg on...