I was on the birth control patch five weeks ago. I switched the birth control patch to the pill, because of bad side effects. When I was switching my boyfriend and I had sexual intercourse. I completely forgot that you are suppose to wait 7 days after being on the pill before having unprotected sex. But we did. I'm now on the "inactive" week on the pills and have been for four days and I have NOT started my period. Could I be pregnant?