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BBT chart at 9DPO

Maria • Sat, Oct 28

Although my chart says I ovulated on October 18 I didn’t. I actually got a positive OPK on October 18 and ovulated on October 19. I took a test and it was negative. Today it’s 9dpo not 10 as my chart says. It’s a day ahead. What do you guys think are my chances per the chart? I got a bbt rise this morning which is why I thought I was pregnant but it was negative.