Huge temp dip mid cycle

Hi I'm on cd13, I've had a huge temp dip and that it stayed the same as yesterday. My previous charts didn't do a drastic dip like this.
I started clomid this cycle could this be why? And do you think ovulation is close and that's why it's dipped so much?
I know you can only usually see ovulation after but just looking for clues, my fertility monitor has read high for the past 3 days, no positive opk strip but very slowly getting darker.