late period and unprotected sex

Hi 
My last period was on dec 26 and as per the app my period is 9 days late till today. I had protected sex 2 weeks before today(29jan) and yesterday i had unprotected sex. I got scared and took a planb pill . But still i am totally worried because I don't want to be pregnant! I don't know if its worth to worry or not. Please suggest 

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