help me out please

isachi
i had sex with someone 3 weeks ago, we used a condom that did not break, and he didn't even ejaculate. 
my period is unexplainably 4 days late, i am worried now that i may be pregnant. pls ease my mind, i am going to take a test soon. the odds are so unlikely but why is my period late?? could i be pregnant? 

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