Ovulating Early?

Just finished my period and I'm already getting High results on my CB Fertility monitor - I'm currently on CD8. Has anyone else had this before? I had a miscarriage back in January and it totally threw off my last cycle. I'm usually 28 days and ovulate between CD13-15 but didn't end up ovulating until CD19-20 and got my period on CD35. Once my period finished I started testing as per the monitors instructions and have been getting High readings every morning. Just looking for similar experiences