Bleeding before and day before ovulation

Hi! I’m supposed to ovulate tomorrow. Since Friday I’ve had some light spotting. Tonight, however, the bleeding was darker and came on quickly with a visible blood clot. I’m 10 months PP and EBF so I’m worried that maybe my period has returned but that I’m not ovulating. I have an opk I can use for the next cycle if we don’t get pregnant, but I’m wondering if anyone else has experienced anything like this and if they got an answer. I’m worried this is anovulation related to PCOS (one doc said I had PCOS 3 years ago but everything has been normal and regular since).