Confused..3 days late but BFN test results

Taylor • Married last summer, 26 and TTC #1
Hi all, I was suppose to get my AF on Thursday (and usually get it on the day predicted or one day before) but I'm now three days late.  I have taken two pregnancy test ( I ordered the cheap strips online) and both were a BFN
​I am getting cramps but no sign of AF and have never been late before..
​Is it possible I'm pregnant and it just didn't show on the test?