28 dpo.?!?!

Krystal • Family & Faith are #1.
Ok so today I am 28 dpo & I have been spotting on & off today. But I took a pregnancy test  6 days ago & it was negative. So I read
 u can take a ovulation test & if ur pregnant it comes up as a lg surge. so i took a test every day for the last five days & the all came up really positive. 
​So I'm not sure what to think.. Help.!!  Has this something like happened to any one els.?