My cycles keep getting longer and it's hard to know if I'm pregnant or not since I'm spotting and…

My cycles keep getting longer and it's hard to know if I'm pregnant or not since I'm spotting and have been for about 4 days now. Since December my cycles have been. 25 (December-January) 26 January-February 30 February- March) then 36 (March - April)My last period was April 16th-April 21st. It's now May 26th and I've only been spotting. I took a pregnancy test 3 days ago and it was a BFN. /: I miscarried last year April 10th and since then my periods haven't been a regular cycle really. Any thoughts? You think I am pregnant or no? I hate the waiting game.