FERTILE CYCLE?

Jasmyne • 21! Pregnant with my first

So I tested this morning with the digital clear blue ovulation test and it had the blinking smiley face. But I just tested again cause I like to make sure cause idk. And it came up with the clear circle. I did use a different tester but that shouldn’t matter right? Please help my husband and I are ttc and I wanna know why it changed?