I've Been On Cryselle Birth Control Since August 3rd. Took

I've been on cryselle birth control since August 3rd. Took all my active pills on time. On August 17th I had unprotected sex but still used the pull out method. I'm now on day 5 of my inactive pills and still haven't gotten my period. I've been having cramps and my acne has increased like it usually do when my period comes but it hasn't come. Am I pregnant? Is this normal?