I now have sufficient information to provide a complete, textbook-backed answer. Let me compile the response.
"Significant lacerations to the cervix or vagina may also occur during childbirth, particularly with instrumented deliveries ... These lacerations may present as persistent bleeding, not readily recognized due to their location, and often in association with a firmly contracted uterus." - Schwartz's Principles of Surgery, 11th ed., p.1833
"Vaginal lacerations may be repaired primarily but should only be closed after deeper tissues are inspected to ensure no active bleeding." - Schwartz's Principles of Surgery, 11th ed.