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BBT charts seem confusing!

Co • Sat, May 26

I am new to charting, just started 3 days ago, so I dont have a chart of my own to show yet. I've been looking at other peoples charts on here to try to get an idea of what to look for and it seems like there are a lot of ups and downs going on. I am wondering, how do you figure out which upward spike is the one indicating ovulation has occurred? And what is the coverline?