Fertilization: The process of combining the male gamete, or sperm, with the female gamete, or ovum. The product of fertilization is a cell called a zygote.

Fertilization, union of a sperm nucleus, of paternal origin, with an egg nucleus, of maternal origin, to form the primary nucleus of an embryo. The most primitive form of fertilization, found in microorganisms and protozoans, consists of an exchange of genetic material between two cells.

Fertilisation occurs when a sperm fuses with the female act during intercourse and further forms an egg that gets implanted in uterus of the female. The sperm travels through the fallopian tube and penetrates the zona pellucida layer of the ovum (female egg) and fuses with it which forms zygote (fertilized egg).

Fertilisation is the fusion of the nucleus of a male gamete with the nucleus of a female gamete, producing a new cell called a zygote .

Some women do notice signs and symptoms that implantation has occurred. Signs may include light bleeding, cramping, nausea, bloating, sore breasts, headaches, mood swings, and possibly a change in basal body temperature.

• 5 steps of the in vitro fertilization (IVF) process.
• Step 1: Medication.
• Step 2: Harvest the eggs.
• Step 3: Fertilization.
• Step 4: Embryo culture.
• Step 5: Embryo transfer.

Pregnancy begins when a sperm fertilizes an egg. This usually occurs in the 2 weeks following the first day of the most recent menstrual period. In the first few weeks of pregnancy, a woman may have no symptoms. Some can sense that they are pregnant, but most do not suspect it until they miss the next period.

Along with cramping, you may experience what is called implantation bleeding or spotting. This usually happens 10 to 14 days after conception, around the time of your usual period. Implantation bleeding is usually much lighter than your regular menstrual period bleeding.

Can you feel when an egg gets fertilized? You won’t feel when an egg gets fertilized. You also won’t feel pregnant after two or three days. But some women can feel implantation, the process in which the fertilized egg travels down the fallopian tube and buries itself deep within the wall of the uterus.

It’s possible to feel yourself ovulate, but many women don’t notice it. You might notice a slight pain in your side about halfway through your menstrual cycle. But if you’re trying to get pregnant, don’t wait for the twinge. That means your fertile window is soon closing.

Some women may notice symptoms as early as 5 DPO, although they won’t know for certain that they are pregnant until much later. Early signs and symptoms include implantation bleeding or cramps, which can occur 5–6 days after the sperm fertilizes the egg. Other early symptoms include breast tenderness and mood changes.

Further Signs of Successful Implantation

• Sensitive breasts. After implantation, you might find that breasts appear swollen or feel sore.
• Mood swings. You might feel emotional compared to your usual self, which is also due to changes in your hormone levels.
• Bloating.
• Changing tastes.
• Blocked nose.
• Constipation.

Pregnancy After Ovulation Getting pregnant after ovulation is possible, but is limited to the 12-24 hours after your egg has been released. Cervical mucus helps sperm live up to 5 days in a woman’s body, and it takes around 6 hours for active sperm to reach the fallopian tubes.

Pregnancy doesn’t start the day you have sex — it can take up to six days after sex for the sperm and egg to join and form a fertilized egg. Then, it can take three to four days for the fertilized egg to completely implant itself in the lining of the uterus.

When there is an egg waiting, conception can occur as soon as three minutes after sexual intercourse. That said, sperm can survive inside the female reproductive system for up to five days. 3 This means that the day that you had sex won’t necessarily be the day that you get pregnant.

Last Menstrual Period Conception usually occurs around 11-21 days after the first day of the last period of a woman who has a regular period. The estimation of conception date is based on this, but is rarely ever exact since it is difficult to know exactly when ovulation occurs.

It can be confusing during the first month because pregnancy (which is an average of 40 weeks long) is actually measured from the first day of your last menstrual period. Even though you likely ovulated and conceived only two weeks ago, technically, you’re considered to be four weeks along.

The first is non-invasive prenatal paternity testing, which involves sampling the DNA in your blood. This is then compared to DNA from a cheek swab taken from each potential dad. It can be carried out from seven weeks of pregnancy. The second is invasive prenatal paternity testing.

Since conception usually occurs about two weeks after the first day of your last menstrual period, that would give you an estimated date of conception of 21st October, which would make it impossible for this man to be the father of your child.