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Is it possible Having sex right before a period can make your period late?

I had sex on Jan 14 and my gf said that she usually starts the 16-18 it’s now the 21st and she still hasn’t had it!
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973741 tn?1342346373
Probably not but lots of things can make women late such as changes in routine, illness, weight gain or loss, stress.  It's not uncommon for girls to be late.  Did she finally get her period and all is good?  Hope so.  
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Austin, TX
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