Scared of being pregnant

My boyfriend and I had relationships like three weeks ago we used condoms but one broked. He told me he felt the breakage when he was outside so he's basically sure that it didn't break inside. We had relations out of my fertile zone. 
I'm pretty scare because my period is late now. I have a menstrual flow about 32 days approximately. 
Do you think there's something to worry about? 

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