Pregnancy symptoms and to test or wait?

My period isn't due for another 5-8 days (cycle varies) but my breasts have been very sore and sensitive to touch for a week straight now. I've been increasingly tired and requiring more sleep than usual, and waves of nausea after eating sometimes, as well as randomly at least once a day. My cat has also been extra cuddly and affectionate which I know seems like it should have nothing to do with pregnancy but I've heard before of people's animals knowing before they did and acting like this. Don't want to be "forming a case" for a positive and them test and be disappointed. Should I test tomorrow or wait for my period?