im 18 and im scared not to long ago i was a week and a half late for my period and i got somthing lik a period but it was a reddish brown and then truned brown and lasted about 4 days then i started cramping but i dont cramp all the time i more get butterflys and my stomace is always bloated and my face is getting fatter. along witht eh rest of my body i have taken tests and they all have said that i am not pregnant. what do i do?