plsssss tell me what can it be

Hi ladies . 
To make the story short 
I had unprotected sex on Monday . 
My period supposed to start on Friday ( I always have it on time ) 
But it's late 
I had few tests , they all negative ( I know it's early ) 
Right now it's Tuesday 
And the period isn't here yet !!!
Can I be pregnant ? 
When to test ??????
:(( I m so confused 

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