I am on Birth Control and for my last pack that i started i somehow confused the sides and stated taking my pills from the other way around which means that i was taking my suger pills instead of my regular pills for a week then i noticed it and again started taking my regular pills. My pack starts on Sundays after my pariod and i swiched my pills on sunday after i found out that i'm taking it wrong. This means that i was taking sugar pills for two weeks, befor my period and after my pariod. and i had sex a day befor i found out that i'm taking wrong pills. After i had sex the next day i was on the right pill again. I have nausea this couple of days and i am afraid of getting pregnant.
Please tell me what could happen from confusing the pills and how big is the chance of getting pregnant?

Thank you,