Hello. From yasmin pills i switch to althea this month. I finished my althea 21 pills last 14 November and still i dont have menstruation yet. Last month after i finished drinking my 21 tablet pills immediately got a menstruation. Im thinking i havent have my 32 days cycle that's why its delayed. Could it be possible because my last period was last 21 November. I have no signs of pregnancy. Thank you for your answer!