Yeast infection?

Brittany☀️☀️ • 20❣ #1MC💔 && #1TTC🔐
I'm 5 days late on my period and I took an yeast infection pill Friday before my period was supposed to come and then Saturday I had this brownish discharge  and then Monday no period & I took another yeast infection pill Wednesday... I was wondering could the pull mess up my periods or show an false negative?!? I'm really worried because I'm 5 days late and still no AF....  And been taking test and still bfn... 😒😫💔