2 day period? Tmi

Emma • eptopic pregnancy 6th September 2017 🌈 #9years TTC for our rainbow 🌈 #Nurse #secondyinfertility
So I bled for one day,  second day I just had brown discharge?  I was a week late to, Tested BFN's.. I haven't been stressed or any other cause for concern in my life.. Nothing has changed? Very confused very Crampy to?!..  Any ideas? 
Thank you