Is it normal to bleed (menstruation) after tip Rhinoplasty?

Hi, I just had closed tip rhinoplasty performed on 9/10/14. My menstrual period is very regular(every 28 days) and my first day of regular period started on 9/4/14 and lasted until 9/8/14.. Its usually only 3 to 4 days. 2 days after my surgery( Sep 12) I started bleeding again and I am now still lightly bleeding. Is this normal? Is this a new period? Will I still get my regular period 28 days after the 4th? I don't take birth control and just want to know when to expect my regular period back. Thanks!