Could I be pregnant?

Hey guys! I have been having nausea lately, as well as sore and tender breasts.I started my period early, however it was abnormally light and lasted for a day and a half, usually heavy and five days or so long. I didn't really get cramps like I usually do. Early signs of pregnancy, or just abnormal period? I did have unprotected sex with my man of 3+ years and I've never been able to remember to take my pill same time every day. Sometimes forgot that day all together. Thanks for the help!