Strange cycle. Is this due to stress?

My cycle usually is predictable touchewood. However this time around, I feel something is off. I got periods one or two days earlier than expected & light periods. It's not unusual to get light periods so i continued testing for ovulation using inito monitor & strips. I was shocked to see low fertility on the inito monitor for all days when usually ovulation is expected. I also tested with usual lh strips & only got a faint line. And the mucus also went missing. Curious, i also tested with a pregnancy strip & twas negative. Now am worried, till last month everything was ok so why is this cycle turning out to be so weird, am saying this because i never saw this, i have been tracking cycles since last year so what could be wrong, is this due to stress?