Clear Blue Ovulation Digital Test

I feel silly for asking. I'm SO new to all of this. But I bought these tonight as we are just starting to try to conceive our first 🤞🤞🤞 ... when is the best time to test? I dont want to waste these, as they are quite expensive!!! Any tips on anything surrounding conception is and are appreciated! Fertile window due to start tomorrow. So now would be a good time to test, yes?