Yosiget, or drospirenone ethinyl estradiol tablets, are not effective in achieving contraception after the first day of administration. Drospirenone ethinyl estradiol tablets is a short-acting contraceptive pill containing estrogen and progesterone, which can inhibit ovarian ovulation and achieve contraceptive effect when taken, but there may be adverse reactions such as irregular uterine bleeding, nausea, breast tenderness and headache. Drospirenone ethinyl estradiol tablets need to be taken continuously, starting on the first day of menstruation, with a light pink tablet for 24 consecutive days and a white tablet on days 25-28, all at the same time each day. If you do not start taking the pill on the first day of your period, you will need to take the pill for 7 consecutive days before it becomes effective as a contraceptive. Therefore, taking drospirenone ethinyl estradiol tablets on the first day is not able to achieve contraceptive effect, non-hormonal methods of contraception should be used, and the pill should be taken for 7 days before it can have a contraceptive effect, and contraceptive pills can be used under the guidance of a doctor.