The term navicular bone tends to refer to a bone at the top of the foot, located in close proximity to where foot and ankle meet. While most people will now accept this as the location of the bone, a bone in the wrist, most often called the scaphoid bone, used to be called the navicular too.
24 hours is the usual life span of the ovum. That's why it is important to have intercourse in the days just before you ovulate. Sperm should be waiting inside the fallopian tube when the egg is released to increase the odds of getting pregnant.The days just before ovulation are your most fertile days to conceive.4 hours is the usual life span of the ovum. That's why it is important to have intercourse in the days just before you ovulate. Sperm should be waiting inside the fallopian tube when the egg is released to increase the odds of getting pregnant.
However if the ovulation day is not certain, then intercourse every other day (or every day) around the time of ovulation is a good option. If sperm is normal it should live in the reproductive tract of the female for 3 to 5 days. However, the egg has a life span of only 12 to 24 hours. Therefore, intercourse a day or two before ovulation should be fine, but if the first recent sex is more than 24 hours after ovulation then the egg has already degenerated.