My husband and I are going on 4 years of TTC without a single pregnancy and maybe only 2 "late" periods.  My cycles are so regular.  Well last month my period was weird. Typically I start strong, the next day is light, and the third/last day is pretty much nonexistent. It has been this way since I was 11 years old.  Last month I spotted one day, next day heavy, next day gone, and then very very light spotting only noticeable when I wiped for 4 days.  I also "started" a day later than normal,  the 23rd. Typically I start on the 22nd sometimes on the 21st.