Menstrual cycle

After having a regular 28-day menstrual cycle for years, my period came back 7 days after my last period. But not full flowing, I guess you can say it is spotting every once in a while for the last 3days.
I have to wear a pad constantly. I am 44 years old and I am sexually active. With the same man for over 5 years. What could possible be the reason(s) for this sudden spotting?

Can someone reply on this question as soon as possible please?

[AnnieBrooke]

Perimenopause comes to mind.  You can be irregular with it for years before actual menopause.  If you are curious about whether this is it, your doc can test your hormone levels.

[beebeeburnett]

Thank you for replying to me so quickly. I would like to say that I always was on time with my cycle.
Are you telling me  that if it is indeed premenopause that my menstrual cycle from now on would be irregular?

[AnnieBrooke]

I don't think there is any simple answer that fits all women for what happens during perimenopause.  Sometimes you go on like normal, and other times your period is flaky or coy.  The spotting all the time would drive me nuts.  You could check in with your gyno and see if he or she recommends anything to make that part of it more regulated, such as going on the pill.