So, I have a legitimate question. Maybe someone can answer?

I had my period on the 31st-5th. Half way through, I started seeing changes in my breats' but I was one my period....here it is 9 days later, and I'm still seeing those changes, sometimes they're sore, but not all the time. Anyone know why this might be happening??? If I'm being realistic, I'm probably no pregnant. My husband and I never use protection, but I had a period. Is it possible to have symptoms before your missed period? I've had some light cramping and other things too.