What’s happening😖 BBT chart experts

Can anyone relate to this? Or know what’s going on? Ovulation usually happens between CD15-22...I’m on CD 22 now. I’ve had spotting and very light bleeding for the last 4 days. I ended BC end of June 2017, got pregnant sept 2017 and had a MC in Nov. had a regular period Dec 23. And now this?? I haven’t had any bleeding before a period since I stopped BC. Any ideas what’s going on?