My Fertile Period
your chances of conceiving at each day around the ovulation date
The fertile period is the most fertile part of your cycle. This is therefore the best time to try for a baby. DuoFertility can help you identify your fertile window by closely monitoring your ovulation and helping you to plan baby-making intercourse for the best time of the month.
This depends on several parameters that vary from couple to couple and from cycle to cycle. The lifespan? of the egg?, the sperm?, and the quality of the vaginal environment?, which will affect the lifespan of the sperm, are probably the most variable parameters. Scientific research has shown that the chances of conception? on each day of the menstrual cycle? is variable. The limit of the fertile window that they have identified is presented in the graph. Over 35% of conceptions occur when intercourse occurs on the day of ovulation. There is a 90% chance of conception when intercourse takes place during the fertile window comprising the 2 days before and after ovulation.
Ovulation is controlled by hormones, in particular, the LH surge?, and normally occurs once per cycle. Scientific evidence indicates that in very few cases ovulation may occur twice in one month. If this happens, the second egg is released within 24 hours of the first and simply extends your fertile window by one day.
There is no exact consensus in the scientific community to date, but it is widely accepted that the fertilising ability of the human spermatozoa is 60 hours on average, and can be up to 120 hours (3 to 5 days). [collapse collapsed]
Scientific references (Click here)
Vulvar mucus? observations and the probability of pregnancy.
Obstet Gynecol. 2003 Jun;101(6):1285-93.
Stanford JB, Smith KR, Dunson DB.
Department of Family and Preventive Medicine, University of Utah, Salt Lake City, Utah, USA.
OBJECTIVE: To assess the day-specific and cycle-specific probabilities of conception leading to clinical pregnancy, in relation to the timing of intercourse and vulvar mucus observations. METHODS: This was a retrospective cohort study of women beginning use of the Creighton Model Fertility Care System in Missouri, Nebraska, Kansas, and California. Data were abstracted from Creighton Model Fertility Care System records, including women's daily standardized vulvar observations of cervical mucus? discharge, days of intercourse, and clinically evident pregnancy (conception ). Established statistical models were used to estimate day-specific probabilities of conception . RESULTS: Data were analyzed from 1681 cycles with 81 conception s from 309 normally fertile couples (initially seeking to avoid pregnancy) and from 373 cycles with 30 conception s from 117 subfertile couples (who were initially trying to achieve pregnancy). The highest probability of pregnancy occurred on the peak day? of vulvar mucus observation (.38 for normally fertile couples and.14 for subfertile couples). The probability of pregnancy was greater than.05 for normally fertile couples from 3 days before to 2 days after the peak, and for subfertile couples from 1 day before to 1 day after the peak. The cycle-specific probability of conception correlated with the quality of mucus discharge in normally fertile couples but not in subfertile couples. CONCLUSION: Standardized vulvar observations of vagina? l mucus discharge identify the days with the greatest likelihood of conception from intercourse in normal fertility and subfertility and provide an indicator of the overall potential for conception in a given menstrual cycle in normal fertility.
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