Q: How does the egg meet the sperm?

1. Sperm is deposited in the vagina and moves up through the cervix into the uterus and then into the fallopian tube. The sperms usually survive up to 5-6 days in the uterus waiting for ovulation.
2. An egg is released from the ovary (ovulation). Sometimes two or more eggs are released.
3. Sperm and egg meet in the outer portion of the fallopian tube and the sperm enters the egg (fertilization).
4. If two or more eggs have been release then they all can get fertilized by sperms and twins or more can develop.
5. Twins can also develop when a sperm fertilizes the egg and thezygote or blastocyst  splits in two (or even three or more). 
6. The fertilized egg (blastocyst) now moves towards the uterus
7. The blastocyst arrives in the uterus about 5-6 days after ovulation/fertilization and attaches (implantation) into the uterine lining