Preventing pregnancy?

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Hi., I would just like to know what my chances are of getting pregnant when i'm having sex with a condom and using Triphasil birth control pills(Don't skip pills)? I'm on Triphasil for almost three months but my periods are lighter and shorter is this normal? I had protected sex two weeks before my period was due. Used a condom and the i take my pill everyday. I got my two weeks later on day 28 since my last period but it was lighter but it lasted 4 days. Can these changes be due to the birth control? I really just want to find out that I 'm not pregnant and that the fewer cramps and lighter periods are due to the birth control. Thanks