Hi,
My period usually comes every 28 days, but this month it was 6 days late. I took 1 pregnancy test on the 5th late day and it was negative and took another one in the morning (I heard it was better to do in the morning because levels of HCG are higher then) and it was also negative, and my period started that same day. When it started, it was very light red and it is usually darker. It was a heavy flow for the 1st day and the second day, and by the third day it was gone! Since then it has just been like the brown sort of discharge you get at the end of your period. My period usually lasts about 5 days. I am a little stressed right now, but not so much that I feel like it would be effecting my period. So I can't think of why it would be changing like this? Could I be pregnant? My boyfriend and I always have safe sex, and I can't think of a time where something could have happened to result pregnancy, but I guess you never know.
You might one to try taking another HPT if you think you are. Sometimes periods have a mind of their own though & will do crazy things. It could be that you ovulated at a different time & that will cause your period to be late.