this may just be due to the hormonal fluctuations causing the abnormal bleeding, or the dried blood itself.
if youre not absolutely sure about the tampon, and either way to check the bleeding, id see your dr. this can lead to serious infection. youd likley know with sex that it was there but its possible that it was pressed up high enough, or due to location of the tampon he wouldnt have felt it.
this is all likely due to changing the pill regimen and estrogen abnormalities because of it but we cant be sure.
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