Clomid first round

Hey ladies i am currently taking 100 mg is clomid from cd 3 to 7 today is cycle day 6 so I take 100mg tonight then tomorrow, this was my first cycle with clomid , we been trying to conceive baby number 2 for 5 years ( our little girl Morgan is now 6 years old , I am 35 and plus size and been on the keto diet ( lost 50 pounds ) when should I start using ovulation tests ? New to this I was going to start using them cycle day 8 and who else has Success with using clomid