When to start testing for ovulation on Clomid?

BabyK`sMom • IVF miracle born 4/20/17 x2 sweet angel babies 🖤👼🏻👼🏻 🌈 due 3/31/20
I'm on a new cycle of Clomid. The past 3 months have been 50 mg 3-7 but this month lm 100 mg 5-9. Wondering when I should start testing for ovulation? I've heard that it's not good to test right after the last pill, as you can get a positive test due to LH surge.