When implantation has happened during pregnancy you'll notice signs and symptoms of pregnancy such as tender breasts, swollen breasts, bleeding that can be mistaken for a period, lower back pain, headaches and mood swings as well as faint or light cramping.
Implantation bleeding and implantation during pregnancy usually occurs when your 6-12 days-old fertilized egg attaches to the interior lining of the uterus.
If implantation has happened then the implantation bleeding will happen along with all the other pregnancy symptoms.