pregnant or late because stressed?

Okay so I'm freaking out cause I should've started yesturday
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However I've never been regular, my period comes at random times and I've been super stressed out this whole week 
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I'm scared because one time when I was having sex the condom ripped but right when it ripped he pulled out (never came inside me) and It was during my fertile week.
Please help me I don't want to be pregnant and I don't have any of the symptoms so I don't know 

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