period but no period

I've been on nexplanon since December and I've only had one period. I know that's normal, I know I'm not pregnant. Here's the weird thing to me: around the time every month that I SHOULD be getting a period, I feel like I get extra emotional. I don't have any other period symptoms, I'm just a little more sad and a little more mad. Oh and I also have a lot more discharge. Smells normal, looks fine. All this has happened the last four months now, I thinkkk, it's not like a HUGE change, just a little more emotional and more discharge. Anyway I'm just wondering if that makes any sense? Does my body get any kind of cycle with nexplanon? Or is it all just a coincidence?🤔