Hi, I was wondering if the contraceptive effects of Althea works immediately? I have used Althea as prescribed by my OB for PCOS before but I wasn’t able to continue it for this year except last October 1. The months before that, I did not take Althea and did not get my period neither. Now, I had unprotected sex last September 30 and took the pill around 2pm the following day (October 1). I am just a little worried as I am currently experiencing symptoms of pregnancy, thus my question on Althea’s effectivity.