2 weeks early?

So I started Sprintec (the pill) 5 weeks ago. My first period came in time as normal. Now 2 weeks later I'm having a second period? So this period is about 12 days early... my breasts have also been very tender the last about 3 days. Could I be pregnant? Or...just from starting the pill? I've also been under a lot of stress lately and depression. I'm 23 years old.