OK my last regular period was oct.10... My period is like clockwork (within a day) on nov 6 I began spotting then became a little heavier then very light. The bleeding only lasted about 3 days. With very mild cramps. I was surposed to start me period on the 10th or 11th. My period lasts an average of 5-6 days, heavy flow and very bad cramps. I took 2 pg tests and both were negative. But I have some symptoms... headaches.. bloated feeling,sick to my stomach and tired. Could this bleeding have been implantation? Could I be pregnant? Anyone with any info please help