During this time, you may feel a variety of symptoms that include cramping, spotting, aching breasts, dizziness, fatigue, and more. Some women mistake these symptoms for PMS signs. The reason is that it is not always easy to tell the difference between menstrual cramps and implantation cramps. There have been many women who were ready to jump for joy, believing they were pregnant. Unfortunately, their period began a few days later. If you want to discover whether you should jump for joy or be prepared to try again next month, you need to gain an understanding of the differences between implantation cramps and PMS cramps.