Period question

Hi Everyone. I have been trying to get pregnant for a few months now, I am 28, so this question is important to me. I started to spot for about five days when my period would have normally started. I figured it was a very abnormally light period. It stopped for two days and then this morning I woke up with a very heavy period. Would I count today as my first day of my menstral cycle? If so, it would be 7 days late and I am never late in my period. Any answers or comments would be great. Especially on how I should record it to my glow sheet so I can accuretley know when I will ovulate this month. Thanks so much!