Bleeding 🩸 Between Periods

Okay I maybe overreacting to something that is completely normal but ever since I started working out in August I’ve noticed bleeding/spotting between my periods and just recently my husband and I are trying for our first baby and I’ve noticed it’s happening around the time my app says I’m supposed to ovulate. I’ve taken the ovulation test trips this month but never got a full positive ovulation test maybe I didn’t hit the time where I was supposed to or I’m not sure. I have Graves’ disease so I’m not sure if that can throw of my ovulation cycle or not I just want some answers so I don’t feel like I’m crazy