For the all women who need menstruation recording calendar For the all women who need caring dairy for irregular menstrual pain and menstrual cycle For the all women who want to know the fertility, ovulation, contraception and probability of pregnancy through calendar For the all women who annoys marking menstruation and contraceptive pill on the calendar every time. For the all women who secretly record the symptoms of her body on the calendar. -- Must Have! Menstrual cycle management app, Once [ We fulfill the standard of menstrual cycle management app!] ** Menstrual calendar being more accurate as more as you use! It smartly calculate your menstrual cycle that was really hard to expect when the menstrual pain will come. In the menstrual calendar, you can see the expected menstrual date, ovulation day which has high probability of pregnancy, fertility and taking contraceptive pill at a glance, In the calendar history, you can see menstrual cycle at a glance. ** Taking care of ovulation date and fertility! You can easily recognize the ovulation date, fertility and expected menstrual date at a glance, so you can take care of yourself more preciously. ** Scientific calculation of probability of pregnancy! Based on the ovum survival period for 24 hours and the sperm survival period for 3 to 5 days, the 1 day before and after the ovulation date have high probability of pregnancy. We are displaying the probability of pregnancy as middle in the fertility period. ** The day that needs preparing of body and mind, prepare in advance! The day, for not to be embarrassed! In the needful situations(expected menstrual date/fertility with high probability of pregnancy / ovulation date etc when you want), they let you know the day in advance with alarm and sensible messages. ** Save my precious every day records simply! Save your data in more easier and simpler way than diary. If you sign up, you can store all the data that you record such as menstrual date, loving date, taking contraceptive pill, memo, auto calculated ovulation date and fertility period! Although you change your smartphone or install the app again after deleting, you can have data back in the menstrual calendar when you log in! ** Not only the menstrual date but also the secret love date! You can e

Once -A special period tracker

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