A small amount of vaginal bleeding (similar to a normal period) is not unusual for up to 6 weeks following surgery. In this case, you should use a sanitary towel and not tampons/menstrual cups (Do not enter anything into the vagina for 6 weeks following surgery).
If you are experiencing more bleeding than a normal period, or noticing any clots or abnormal-smelling discharge, then you should visit a healthcare professional for a check up to make sure there is no infection.
Visit www.iapmd.org/surgery for lots of evidence based information and resources for those considering, going through or recovering from surgery for PMDD/PME.