My period is about 5 days late, and for the last year or so my cycle has been erratic and different. In the past, I was very regular, every 28 days and lasting 5-6 days. Now, it can be as early as 20 days and as late as 35 days. My period now is extremely heavy lasting 4 days of excessive bleeding, needing to change almost every hour or so. My last pap smear was about 7 months ago and it was normal. I am 36 years old, am I going through the change or what else could be the issue?