Possible pregnancy symptoms?

I'm buying a test soon, but I could use opinions. I didn't have any spotting/blood this period. Some different, some the same period symptoms. No cramps. (Not normal for me.) Nausea. Fatigue. Back pain. All normal. Gassy. Very very gassy. Constipated. I usually get bad stomach aches during that week. I don't know.. I've been on BC for awhile & I've heard that can make your periods stop, but I haven't been using condoms either. I also just got over being very sick so I don't know if that played a part in any of it. Anyone go through something similar?