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Is an implantation dip a good sign?

I am charting and my bbt took a dive at 9 DPO, then came back up
to regular post-O levels at 10 DPO. Is this an implantation dip?

Implantation dips typically occur between 7 and 10 DPO - or around
the time implantation would happen. There are several theories as
to why this happens. Estrogen levels rise when you become
pregnant, which is associated with lower temperatures. However, a
surge of estrogen is common midway through the TWW... so it
doesn't necessarily mean you are pregnant. Progesterone causes
temperatures to rise, and levels of progesterone increase the week
after ovulation and then start to decrease. Another theory for
implantation dips is that about mid TWW, your progesterone levels
start to decrease as your body nears the arrival of AF. Then
implantation happens, and progesterone levels suddenly increase
again, causing a dip to appear on the chart.

Implantation dips are controversial, to say the least. Some claim it is
an early pregnancy sign, but the fact is that the majority of pregnancy
charts do NOT show an implantation dip - and plenty of
non-pregnant charts do show a dip. There are so many things that
can cause a dip - including sleeping with your mouth open or not
sticking the thermometer into your mouth as far as you usually do. In
my personal charting experience... I had 12 months of charting
before I got my BFP. During that time, I had 3 "implantation dips" that
turned out to be nothing. On my pregnancy chart, there was no dip.
So personal experience has made me skeptical.

Fertility Friend did a statistical study of implantation dips and this is
what they found:

11% of charts that showed ovulation but did not result in a pregnancy
displayed this pattern.

23% of charts that showed ovulation and did result in a pregnancy
showed this pattern.

Of the pregnancy charts that showed this pattern, the most likely
days for the dip to occur were between 7 and 8 days past ovulation.
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