Hello and welcome.
I am Dr. Norm, and I look forward to helping you today.
This longer period and your one hot flash are probably the first signs of the change, which we call perimenopause
. This is the time when a woman goes from regular normal periods to menopause
, the absence of periods.
Perimenopause can go on for years, during which you may notice changes in your periods, such as longer or shorter periods, some irregularity of your cycles, and perhaps hot flashes, night sweats, etc. Every woman is different as to the symptoms she may experience.
Since this is the first sign you've had of perimenopause, it's likely that you will continue to have more or less regular periods for some time. At some point they will become more irregular, and eventually your periods will stop.
There is more information about perimenopause here http://www.mayoclinic.org/diseases-conditions/perimenopause/basics/definition/con-20029473