The attachment of fertilized egg to the uterus lining is referred to as implantation. It leads to a light spotting called implantation bleeding. It is not the same as menstrual bleeding and occurs 10 to 14 days after conception. The implantation bleeding is usually expected at the time of menstruation. However, it can also happen in the first twelve weeks of pregnancy. It usually resolves and does not require any treatment. The bleeding looks pinkish with no clots (seen in periods), and mild cramping is observed.