Similar Experiences? Please help.

TABITHA • I am happily married and a mother to five children. 1 living daughter, 1 heavenly daughter, 2 heavenly sons and 1 living son.
I am currently 20 days late for my AF. At 14 days late I tested and got BFN. Called my doc for advice and he said to test again in two weeks (28days late). Has anyone had a similar experience and come out with BFP. I have issues with ovulation and if I don't get a BFP they are putting me on clomid April 17th.