BFN but 3 days late...

Sarah
Just finished my 2nd round of Clomid. (50mg day 3-7) had pretty bad cramping around day 13-16 and got a Peak ovulation test day 14, so I thought I was ovulating. But now, AF is 3 days late and I got a BFN. Anyone else have late periods when on Clomid &Provera?