Can someone help me pls?? 😰

This is my 3rd cycle charting, and this cycle is completly different from the other 2.i had more flat tempretures the cycles before and now its a completely ziggy zaggy.i take tempreture orally and always at the same time and after a good sleep.I m not drinking alchohol as we re TTC and i  m not doing anything different from what i did the other cycles. What can it be? Should i worry? Is there anyone who could tell me something as i m new to this pls. Thankyou.