Page Six has also reported that the couple, who have been dating since April, are expecting a girl.
According to one source, Kylie has been "looking pregnant for about four months." Page Six also adds that the Kardashians will be confirming the news later on Friday.
The average cycle takes 28 days, but shorter or longer cycles are normal.
You're most likely to get pregnant if you have sex within a day or so of ovulation (releasing an egg from the ovary).
It’s a bit like the first trimester of pregnancy – the most crucial time in the formation of a baby in the mother’s womb.
Pregnant after 2 months dating
It is during the first 12 weeks that all the major organs like the heart, liver and kidneys develop and where the risk of miscarriage or something going wrong with the pregnancy is the highest.
Sami has been seen on The Daily Mail, The Elephant Journal, The Natural Health Magazine, and The Huffington Post.
Getting pregnant (conception) happens when a man's sperm fertilises a woman's egg.
This is usually about 14 days after the first day of your last period, if your cycle is around 28 days long.
An egg lives for about 12-24 hours after being released.