No peak?!

So I’m CD31 today, have been testing every day since the end of my period and testing 2 times a day for about the past 9 days. I haven’t had a positive or even anything close. Should I be worried? I’m tracking CM too but I’ve either had watery or creamy, no egg whites. Could I possibly have ovulated or should I just keep on testing? My cycles are quite irregular to be honest and usually vary between 28-39 days. Any advice would be so appreciated!