Erratic temps on vitex

Mia

First month using vitex (taking 1200mg a day) TTC for 12 months. Last months chart looked good (apart from the fact my cycles are so super long hence trying the vitex) this month it is up and down, no pos opk yet... hoping someone can give me some knowledge if they think it will be possible to conceive this cycle 🤞🏼🤞🏼😓 (top pic this cycle, bottom last cycle)