SHOULD I TAKE A PREGANCY TEST

Okay so I had sex December 16th, but it was protected. (I always use condoms) it’s now January 3rd and I haven’t had my period and it was suppose to start 4 DAYS AGO!! My period is never irregular either so I’m low key scared. I’m not ready to have a child yet and I’m about to freak out. What should I do? Should I be worried? Should I go ahead and take a test or is it to early? Please let me know in the comments. Thanks