This seems different....

My breasts still hurt and I'm on day 3 of a lighter than usual cycle. I'm wondering if my hormones are off for some reason, or if I could be pregnant. I don't see how that could be the case since I have my period. This period has been different though, no clots, cramping for a couple hours second day then nothing, and it has been significantly lighter and watery compared to other periods. I still think I would be considered a period, but wonder why my breasts still hurt this much, totally abnormal for me and my cycle is extremely regular, plus i usually can read my body pretty well. Has anyone else experienced anything like this?