Late but bfn :-(

Katie
Hi ladies , I am now on CD32 usually with 27 -29 days cycle have had lot of nausea and extremely tired for the last week or so and waking with heartburn during the night . I have also had lower back pain for the last week nothing like I usually get with AF tho ! I tested yesterday afternoon and BFN ! Has anyone ever had this before and ended with a BFP ????