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It looks to be on track for a two weeks old sprout. Germination week does not really count in my mind.
Looks like the same size plant as mine on week 2 in my Dinafem OG Kush Diary
growdiaries.com/diaries/49742-dinafem-og-kush-autoflowering-grow-journal-by-m0use/week/241047
I think its growing well, if you want you can try and flick off the seed cap.
I don't think its causing any harm, as the root trunk expands and grows it will fall off.
Best Of Luck!