Been TTC for last couple months and diligently tracking ovulation etc so I know when my period is due. 2 days ago started spotting, that's 5 days earlier than I expected anything and now am having what seems like a light watered-down period. I had already taken an early pregnancy test and it was negative. I have also had flu over Christmas and been coughing a lot ... surely that's not enough to bring on bleeding? Is it? I'm worried there is something else going on. With my last 2 pregnancies I never experienced any implantation bleeding. Just wondering if anyone has similar experiences or other ideas about this...is there anything else I should be worried about? TIA