IWhat??? I’m so confused

Daina • 25. Married 10/29/17, Pregnant with Baby #1

I am on cycle day 41

I usually have irregular cycles my estimated cycle is approx 39-43 days

Because of my irregularity idk when i ovulate I’ve been doing this and opks i think i ovulated on the 19th that’s when my CM was stretchy and egg white and i had minor ovulation cramping.... i keep getting negative tests my boobs are sore but no other symptoms of baby or period yet

I don’t understand my BBT chart at all why so many highs and lows?