Shorter than normal AF...

Nina N • 37 trying to conceive since August 2013
My AF for the first time this month was shorter, i started on Fri very light then slight heavy by evening, Saturday again was not heavy and sunday like end of AF (spotting) spotting today aswell... Im always heavy for atleast 2 full days and gradually bleeding slows down.. Normally all in all last 6 days, this month shorter and on heavy days it was watery with bleeding??