Can BC pills cause you to have a 1 day period?

It's my 3rd month on Taytulla...Normally my periods are 3-5 days.. I just had a 1 day "period" it was around the time as my regular but literally wore light tampon once that day and the next day there was nothing maybe a little spotting thats it..Husband has been cumming in me regularly but I have been perfect at taking my pills on time so I highly doubt I could be pregnant but I am curious and confused haha

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