BFN 5 days before AF..hoping for BFP!?

Here is my story...my cycles are usually 31 days long. My last period started on Feb. 26 ( was heavy by Feb. 28) Had on March 10 (about CD 13) and March 12 (about CD 15) but both at about 2am so pretty much the next day. I took 2 ovulation tests form the dollar store on the 11 and 12 and both were faint ( i know this is concidered negative..so im not sure when i ovulated) frmo the 13-19 had very little brown discharge (really light) March 15 was more sticky, March 16 was kind of Dry, March 17 really bad migrain. Appetite decreased 20-21(but felt bloated). Light Light cramps on the 20th. Tested 21,22,23 all BFN. Period should be here around the 28. What do you think?