No PMS symptoms at all, could I be pregnant?

Every month a few days after ovulation, or about a week before AF comes I always get very sensitive nipples, my boobs get swollen and sore, I get extremely tired, I break out on my chin, and I get crampy. This month I've had nothing at all! AF is due on the 31st, in 4 days, and I feel fine. I have a breakout on my chin but that's about it. I've read that a lack of your usual PMS symptoms could mean pregnancy. Has anyone experienced this and been pregnant? Any input would be so helpful!