Implantation dip or no?

Chelsea

I never got a stark positive opk this cycle (I have a history of irregular periods) but there was one day that was darker than all the other days (January 1). I’ve heard that some women won’t get an obvious positive opk, especially with PCOS. So, we went for it.. and I’ve been considering that my day of ovulation. Here is my bbt chart.. could this be an implantation dip? Or am I imagining things? 😬 Really really hoping to conceive this month 🤞🏻