Mucus assists the sperm to travel and also influences their life span. Sperm survival is very dependent on the cervical mucus which is known to increase their life to up to 5 days. After ovulation has occurred, a definite change from this 'fertile-type' mucus can be observed. There's a simple way of recognising these mucus changes and recording them by using a chart and coloured stamps. A woman's basal body temperature varies during the cycle.
Special charts make the temperature pattern easy to record.
From menstruation until ovulation a woman's temperature is at a lower level. The cervix is higher, softer and open around the time of ovulation, whereas at infertile times it is lower, firmer and closed. Most highly-motivated couples can use natural methods. No, although when first explained it may sound complicated. With experience and support while learning, it becomes easier.