No usual PMS symptoms???

Has anyone found out they were pregnant after having almost no usual PMS symptoms?? I usually get bad acne, mood swings, sore boobs and bloating. My period is 5 days away. Instead I've had this odd feeling on the left side of my lower abdomen. It started with a pinching feeling off and on for a day, and then the days following, it's felt like muscle weakness along with a stretching feeling. Today I had nausea almost all day and a severe headache all day. But no usual PMS symptoms.