Different ovulation date?

Hi guys! I’ve been using the calendar to predict my ovulation but realized it was off last month. So I started testing for this month. The tests were negative for 3-4 days even though the calendar said otherwise. And then 2-3 of those days I got a blinking smiley face, last day being the day before yesterday. I input all this and the calendar would change my ovulation date from Sunday to the 13th. I ran out of ovulation tests and didn’t test yesterday to see if that was actually my peak day. Am I right since the 13th was still a flashing smiley face that I ovulated yesterday the 14th ?