Ovulation days

Ruby

Hi ladies, me and my partner have decided to start trying for a baby. But I'm realising the app may have my ovulation day wrong as I'm meant to ovulate on Tuesday, I've been testing since yesterday and it's showing low fertility. Today being lower than yesterday's.

Is it likely the app could have gotten my day soo wrong and I've missed this month? Anyone ever experienced this?

Thanking you In advance for the replies x