Some say that PMS can sometimes have symptoms that will be almost similar to pregnancy. For example, some people who have PMS will experience having some weird cravings. There are also some who will feel that they will experience some mood swings. Another thing that will be the same is constipation.
Another thing that will be the same is breast pain and tenderness. Just remember that for those who are already experiencing pregnancy symptoms, the pain may last up to the whole duration of the pregnancy, especially when milk ducts start to be filled with milk. Nausea is one of the symptoms that those who have PMS will not experience that those who are pregnant will. Missing a period is also a sign of pregnancy.