8 DPO my chart looks like a zig zag

Jessica
I been bbt for 4 months, I'm very consustant and make sure I temp at the same time every morning, I sleep with it on my side... lol but this month is different... I will post my current chart, and this an overlay from past few cycles... what do you think? Any insight would be great! 
Chart overlay 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors