HELP !!! Something isn’t right lol

So, Iam a women who always had regular periods and pretty spot on when it comes down to it. Never missed, not one !

I’m late on my period about 4 days and tomorrow would be my 5th period day. I have had unprotected sex many times leading up to this.

I’m I still considered a “missed period” of o have not had my period for a month?? I’m not stressed, I eat very well and nothing has changed in my daily life.

Also, I’ve taken test and all of them say negative :/