To be concerned?

My cycle now is clearly way longer than it has been for months. The app continuously pushed back my period date (its a week late now) . No obvious signs of pregnancy, but my period has never been THIS late before. Slight nausea, a little sensitive to smells and cravings for things I don't like. I downed a cup of coffee and I hate coffee. Last time I had sex was April, May my period was actually only two days, but it was lighter than normal. Anyone have any input, besides the obvious to take a test?