Going crazy!

AF is late but still getting bfn! Backaches and cramps on and off for the last 3 days. Just when I think she's coming they stop and nothing. Headaches everyday and even had a dream I took a positive pregnancy test (that's what happened when I became pregnant with our first, tested that morning and bfp) but this time around, nothing. Trying not to stress or get my hopes up as we only have 1 cycle left to try again before hubby leaves for deployment. Anyone late for AF and got a bfp later than expected?