in short... no.
At 3dpo the embro hasn't even implanted in your uterus at 3dpo. It may, however indicate that you haven't ovulated... depending on how much of a decrease it is.
I have been using the Maybe Baby Ovulation Kit so based on the ferning patterns observed I am sure I ovulated on the 24th Feb. On the 25th and 26th Feb my temps went up by 0.2 ° C to 36.9°C and by the 27th Feb they decreased by 0.2°C degrees to 36.7°C.
As Tanya mentioned, it's too early to rule yourself out of the game, besides a temp decline that minimal is nothing to worry about, it usually takes quite a nosedive when A/F is coming. When will you be POAS, around March 16th?? vibes for you my dear.
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