help....

So last month I took plan b and my period came
Four days early. This month, 2 weeks ago my bf and I did anal sex and cum went into my vagina and I took plan be on that same evening. My period is supposed to be today or so but it didn't came... Took the test and neg. I'm kinda worried but from my condition will it be super late?? Since I took one last month and this month? Please help me.