Confused?

Kim • TTC #3 since March. Have a baby girl born March 2013. Baby boy born March 2016.
I'm very confused on my chart. My temps have been all over since ovulation. I haven't been taking them at the same time everyday since I'm done with work for the summer, so that hasn't helped. It dipped below my
Cover line so I assumed AF was on her way, but then it cenback up today. Took a text yesterday and bfn. Is there still hope? I will take another test tomorrow but then I don't know. Any opinions would be helpful thank you!