i just finished my first pack and am on the 4th pill of the secon...

i just finished my first pack and am on the 4th pill of the second pack and i haven't gotten a period. its just this brownish stuff which is gross haha. i don't know its kinda freaking me out but theres no reason i shouldn't be getting one except if the pills not letting me. before the pill it would come eh pretty regularly and would be REALLY heavy. and now i haven't gotten one soo i don't know. the only side effects I've had was for the first day i had HORRIBLE nausea/cramps. it felt like somebody was stabbing me or something and i couldnt move. for a while. and I've been craving anything sweet =P and my face is pretty much perfectly clear haha if anyone has anything they can tell me about the no periods that would really be helpful thanks.