Tested to early ? Or this correct

Had unprotected sex on the 6 of December but he pulled out in time but lately my nipples are very sensitiveand I don't get my period til the 26 and I tested on the 19 it says not pregnant or should I tested again on the 24 or the 25 ???? Help HELP NEED ANSWERS 
 hould I do other one on the 25 

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