Implantation or early period?

Not supposed to start until Thursday (I have rarely started early based on my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a>, usually start later based on the <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> predictions. I have this spotting going on, high cervix (usually reachable), and lotion/creamy cervical mucous.