IN NEED OF HELP⁉️⁉️⁉️Please respond

I am a day late for my period. I took a test the day my period was supposed to start which was Friday, it came back negative. I used the Walmart 88 cent test..today will mark day two of me being late.. I have also been taking antibiotics if that has anything to do with my cycle being late? If not when should I test again?