EARLY PREGNANCY SYMPTOMS? help

What is the earliest that you can feel pregnancy symptoms? 
Frequent urination 
Sore back 
Pelvic pain (period pain feeling ) 
How early can you get these symptoms? I had sex three days ago... I had sex on the last day of my period and took my pill that night, we also used condoms.. We don't think it broke. 
Would I get symptoms this early? 
I take my pill perfectly and always use condoms. 

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