No, there is no reason why. Some women notice implantation symptoms and some do not. Also, for some might be very obvious, but for others they are basically the same as their common PMS symptoms.
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)