why does not all copulations lead to pregnancy???

There are various reasons due to which pregnancy do not occur even after copulation. Some of them are-

• Use of any contraceptive barrier at the time of intercourse.
• The zygote do not get implanted in the uterine wall.
• sperms are not able to reach and fuse with the ova.
• The egg is not released when copulation is taking place.
• Due to poor health condition and hormonal disbalance, female in not able to conceive.