Signs of ovulation but negative opk?

Sylvia • TTC w/ PCOS. This is our first cycle and will be starting Clomid for the first time in this cycle.
I finished Clomid Saturday. I have been checking cp and cm(which I am not good at) and taking bbt. I have a .4 degree drop in bbt temp and more sings say I am ovulating but the tests say I am not. Anyone experienced this. I go tomorrow for ultrasound but i am nervous the Clomid didn't work.