You need 10... but she's got plenty of posts.
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Okay... without seeing your chart, I would say, yes. It sounds like you are indeed experiencing a temp dip. I would not be surprised if you do O today. What is your cervical fluid like today?
Generally temp dips are followed by a spike in temps. So if you are TTC, I would grab DH and get yourselves busy just to be on the safe side... because once you see that temp spike, it'll be too late.
Also, I don't know if you've been doing this or not... but I HIGHLY recommend you check your cervical fluid and mark on your chart whether it's dry, sticky, creamy, watery or egg white. That way you have that to tie together with your temps so you can really be sure of what's happening.
Hope to see more of you here on the board!!