What Causes Cramps,fatigue,light Bleeding And Brown Clots ?

Hi, i am on bc and was supposed to get my period the week of valentines. i was going to vegas with my boyfriend and didnt want my period so i skipped those week of pills and went directly to a new pack. we have never had sex, we did try unsuccessfully however. we came home on tues 15th and i missed that pill. On that thurs (17th) i noticed i was crampy and had light bleeding even though i shouldnt get my period for two more weeks. ive been very fatigued and stressed but i also noticed like brownish clots, its nothing like what my normal period is. im just worried its sunday the 20th now and the clots are still occuring, theyre like dime sized very dark and look almost like boogers (very gross, sorry) im just really scared, whats wrong?