Best time to take a test?

Rosie • TTC for my rainbow baby!! 🌈❤️
Hey ladies...
What's the best time to take a pregnancy test? Obviously none of us that are TTC, especially for our rainbow baby <3, want to wait for the two weeks. But I know within a week before aunt flow comes, most tests should be positive if you're pregnant. Every month I hope and pray I get pregnant. After losing 3.. I want my rainbow :( my period is due in 7-8 days this month. One app says the 25th and the other says the 26th so either way, if I took one now, it should come up positive if I am pregnant, right? I just really don't wanna take one and be disappointed. I want the double line!!!