Should I test again?

I feel so confused- I have an irregular cycle that ranges from 30-37 days roughly. I received a peak opk reading on Monday 1/3 so I assumed my period was due yesterday. I had light spotting yesterday and today but it definitely isn't a full AF yet. If AF was supposed to start 14 days after ovulation, shouldn't I have gotten my period yesterday? I took 3 tests over the weekend and all were BFN- is there any chance I'm pregnant or is my cycle just messed up?