Implantation Bleeding question

Hi ladies! I'm TTC for baby #1 and it month 4, so I'm new to all this! My period is suppose to start next week, but I've started spotting. Yesterday it was a light pink with a sticky consistency and today it's a dark brown. I'm typically regular, so I'm surprised by the early spotting. I'm experiencing light cramps and breast soreness.  According to Glow, I ovulated on the 8th. What are your thoughts? What were your experiences? Thank you!