Many women hear the term implantation bleeding used a lot in regards Pregnant zetmovies porn the early stages of pregnancy, but unless they receive clarification on what this phenomenon actually is then it can be a scary experience. During the early stages of pregnancy the ovum, or fertilized egg, attaches itself to the uterine wall. This always occurs within the First Trimester and can sometimes cause a little amount of blood to be released. This is the cause of implantation bleeding. Some women might feel Cramping Along With Implantation.