Related to pregnancy?

Hey, so my husband and I had intervourse a few times during my fertile week. I know you have to wait until around 12 dpo to get results, but j am currently 4 dpo and exhausted! I'm usually active all day and a night owl and last night couldn't stay awake past 9 and it isn't even noon today and I'm in bed. Do you think this could be related to pregnancy?

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