late period... could it be stress?

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Soooo it's been about 2 weeks since the last time I've had sex and while we used condoms, I am now 4 days late on my period. 
I'm thinking it's due to the stress of a break up I've been through (with the guy I've last had sex with) which is why I'm freaking out.
Can someone give this gal advice?

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