Symptoms or my mind playing tricks on me!

My period came a week early last month because of missing 2 pills (I know, I know...) and lasted a total of almost 2 weeks. I've been feeling really bloated, but not a gassy-type feeling. I also keep thinking that I feel a stretching or other weird feeling in my stomach. Yesterday I started feeling nauseous when I woke up and have felt it off and on since then. My period isn't technically due for another week even though it's been 4 weeks since it came last month. I've been under some emotional stress this week, so I just wanted to know if anyone knows if these could be really early symptoms or even my mind playing tricks on me!