Are false negatives common? Should I test again ?

Im 13 days late and I tested about 4 days ago and it came out negative. I noticed I didn’t get my period once my 5 days I was supposed to get it passed. I’m just worried since I did drink alcohol before my missed period and during while I still hadn’t noticed I was late. Once I noticed I stopped just in case. But idk what could be causing my late period.

*Side note I did take a Plan B 3 weeks and 4 days before my missed period so idk if that could affect the changing of my cycle? Or would it not since it was a while ago since I took it ?

*Edit * I did have unprotected sex after the Plan B... TMI quite bit.