Late . . . Pregnant ...???

According to glow I was supposed to get my period yesterday but still no period. My other period app says I'm supposed to get it today but still no period. I took a test on Sunday the 28th of September but I drank earlier on the day. It came out negative. Could this have been a false negative pregnancy test ?! I don't want to test today because I feel like I should wait one more day to avoid any false negatives or positives. What do you guys think?! Thank you 
Last day of period : September 1st (on time  according to glow)
Cycle : about 29-30 days 
Unprotected sex : 15, 17, 18 & 19 . 
pregnancy test : negative on sep 28th 
Cycle: is always regular 
No medication , never on birth control, never pregnant 
Just married 6 months ago :) 

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