I think it is possible for implantation to occur at 5DPO... but it more likely to occur a bit later. I am not sure why you are getting dips. Your temps aren't very stable. Are you temping orally? Maybe next cycle you could telp vaginally, it causes much steadier temps.
Kate, you just need to put the tip of the termometer into your vagina. You chart also shows unstable temps, which may be due to temping orally. Usually Vag temps are higer than oral temps, but they are usually more stable. Wait until you are due to start a new cycle and see how you go then
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