And unless you are extremely textbook, 14 days might not matter. If you had intercourse at any time during your cycle (specifically the mid point around 12-20 days in) then you could be pg. I've heard of women having intercourse on CD7 and getting pg. It can happen.
Please go to the Dr, I've heard shoulder blade pain with cramps and spotting could be an ectoptic pg. I've heard they can also show BFN when you still are pg. If you are still having these symptoms check it out.
When was your last period? Count 14 days after that date, and if you had interecourse, you are probably pregnant. You symptoms sound accurate, and sometime tests are a little difficult. Try taking a morning urine test. It detects the pregnancy hormone the best. Good luck to you!
ave you missed your period yet? What kind of test did you use? Some test cant tell if your to early.