Hello Cycloreg is a medication called Norethisterone which is a synthetic progestogen used to regulate the menstrual cycle. Normally, your menstruation should start right after you stop taking cycloreg if it isn t you should take a pregnancy test to make sure that you are not pregnant if there s any sexual activity in the last month. Cycloreg isn t a contraception because it should be combined with estrogen to prevent pregnancy. For that reason the pregnancy is possible and you need a method of contraception, you can use a local contraceptive, but always even with using contraceptive there s a slight possibility of pregnancy changes with type of contraceptive. Hope I answered your question Best regards Dr. Noor Farid