TTC. Ovulation Tests?

Hey Ladies, I was wondering if any of you can help me. Me and my partner(Fiancè) have been TTC for over a year now with no luck😟, after loosing our first angel back in 2016😭💔. I've just purchased some ovulation tests and wondering what you all think of them? Are they any good? Whens the best time to use them? Any replies would be very appreciated. Good luck to all you other ladies out there TTC. xxxx