What are the signs of ovulation???

Hi, I'm really confused as to when I ovulated. the app showed that I ovulated on the 7th. I've read it online that when you get like a clear, stretchy, watery and very similar to raw egg whites, This means that you're most likely ovulating. but I got this type of discharge on the 12th and 13th. does that mean I ovulated late? and also, my period is like late for 2days but I'm having little to no discharge at all. is this normal?