I am extremely regular and can pin point the exact time for my period and this month I started bleeding 3 day before I was supposed to and it was a heavy deep red color for almost two days then stop completely and 3 days later it sta Back up when I went to pee so I put a tampon in and checked it eight hours later and it was so light and with pink and brown discharge. What could cause this? I have also had a really bad headache for the last three days. Ps I am under a lot of stress but have been for a few months now and it hasn’t changed my period!