Cycle or app off?

A :)
So I've been using glow for about 6 months now. It's been fairly accurate with my future cycles. However my last periods were about 40 days apart. My last one started on the 12th of this month. The chart shows next one to start in about 2 weeks. It shows that this week is my fertile week so we've been going to town. But as the week is going on in noticing more symptoms like my period is going to start any day now. Is this an early period or just from ovulating? I never paid too much attention as I wasn't trying too much before this. Or is this my body making up for the super long cycle before?