Calling ALL CLOMID USERS

Im at the end of my 4th round, 50 mg, days 3 - 7. The past 3 cycles ive gotten my period exactly 27 days after the last pill, this cycle im late by 3 days and took a cheapie and got a BFN. My breasts still hurt but no AF. Am i testing too early? Anyone go through a smiliar situation with clomid still had a BFP?