14dpo bfn ?

Alisa • This is mine and the hubby's 1st kids, yep kids we are having twins. Due May 5th
Hey ladies? Got a question I have been TTC for 8 months now, last month was my 1st month on clomid. I am 14 dpo ( tested this morning got BFN) today I  started cramping really bad ( I have endo) so I thought my AF was coming, ended up only having brown discharge for about 3 hours and then nothing. Not normal for me at all.. Anyone else ever had this happen before?