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Big drop?

I stopped charting a few months ago because it was getting to be too stressful but for some reason something told me to start again and I started back up two days ago. I actually O'd on June 25 so I'd be around 8dpo. I know there isn't a lot to go on because I haven't been taking my temp the rest of the month but I was just wondering why I'd have gotten a .7° drop.