1 day period?

My period was expected on 8/29( im irregular so my period is NEVER on time) i ovulated 8/15 so exactly 2 weeks later on 8/29 in the evening i spotted brown which i thought okay its my period.. well i only bled for one day friday 8/30 it was not heavy nor light... ive never had a 1 day period they are usually 4-6 days long. I took a pregnancy test sunday 9/1 and it was negative.. However, yesterday and today ive been feeling very tired!! Toooo tired i was even falling asleep when i was driving home from work yesterday.. has anyone experienced this?