Pregnant ?!

Alright so , I think I might be pregnant. I'm showing a lot of symptoms. Nausea,Breast pain,mood swings, food cravings, etc. but I did get my period I got my period July 1st To the 7th normal period. Then I got it again July 28th to August 2nd. Really abnormal not heavy like usual and just shorter than usual. I need some help I'm nervous about this.