spotting between every other period.

Few months ago I started spotting halfway through my cycle - it lasted a week (same as my periods), so I spoke to my GP and she said it could be due to stress and hormone levels, but I could go in for a swab if I wanted - wasn't quite brave enough for that so I waited it out and kept track of my symptoms.

Lo and behold, my next period started exactly a month after the first day of spotting, and my cycle has remained regular since then. But I've been spotting between every other period, usually only when I wipe. Colour is light-dark brown and occasionally mucousy if I'm having a no. 2. Sometimes I experience very minor cramps. It only lasts for a few days, but always during my fertile window.

I'm not using any type birth control, and I'm not sexually active with anyone.

My sleep schedule is a mess, though, and stress/anxiety levels have been sky high throughout lockdown - so maybe it's messing with my hormones...