Im with adkins_81, last month i had cramping around af and just assumed it was that, but she didnt come and all my hpt and bt's came back -ive. I am usually regular 28 - 30day cycle so i was a bit concerned that by cd43 af still wasnt here and i wasnt pg. Anyway my dr seemed to think that i o'ed quite late and the cramps were o cramps - i didnt believe him but 14 days after the cramps and cd44 AF came. Dh and i didnt bd aroung my actual o time because i swore black and blue that i already had so i was a bit annoyed at that. My advice would be bd for fun just in case, but i really hope for you that you are pg and you'll get your BFP in a few days.
Also you could go and have a bt as some women dont get bpf's on hpts
Good Luck