The ovum or egg cell.
He did not "cotribute" anything, in fact, no one has ever "cotributed."
Conception happens when a fertilized egg embeds itself onto the maternal endometrium, in the womb. This is distinct from fertilization, which happens when a sperm cell makes its way into the egg. There is some period of time between fertilization and conception.
Conception begins.
Fertilization
The sperm cell and egg cell
A conception calendar is used to estimate when a baby was conceived. It usually uses the date of a woman's last menstrual period to estimate conception and due date.
Conception or fertilisation are both terms applied to the fusing of sperm and egg.
If a woman gets her period it is unlikely that she is pregnant
conception occurs when a sperm cell successful attached itself to an female's egg. And the process of its rolling down the fallopian tube. conception occurs when a sperm cell successful attached itself to an female's egg. And the process of its rolling down the fallopian tube.
A zygote is the single cell that results from the fusion of an egg and sperm during conception. The zygote undergoes cell division through mitosis to reproduce and develop into a multicellular organism.
Yes, a woman can spot four days after conception takes place. If you are worried, you should visit your doctor.
14 days after conception a woman can determine pregnancy with a pregnancy test.