Stepping out in the rainy L.A conditions, the 32-year-old reality star appeared pale and withdrawn.
Feeling the strain? Pregnant Kourtney Kardahsian looked tired as she went shopping at the Topanga mall in California yesterday
And seeing that she is just eleven weeks pregnant, there was little sign of a baby bump under her outfit.
Kourtney may have also been shopping for her son Mason, who turns two tomorrow.
Exhausted? Stepping out in the rainy L.A conditions, the 32-year-old reality star appeared pale and withdrawn
She later put on a face of make-up to join her sister Khloe at their local Barnes & Noble in Calabasas, where they met fans and signed their book Kardashian Konfidential.
At the event Kourtney appeared perkier as she smiled and posed for pictures alongside her younger sibling.
This time she wore a pair of black leggings, a cream sweater and an oversized black vest.
She also slipped on a pair of the Kardashian's preferred shoes, some over-the-knee boots.
Low-key: Opting for a make-up free outing, she dressed comfortable and warm in an oversized black sweat shirt and grey skinny legs jeans
It is not usual for women to suffer from uncomfortable pregnancy side effect during their first trimester.
Surging hormones can cause a variety of symptoms such as fatigue, stress and nausea,
Kourtney and partner Scott Disick, 28, announced their baby news at the end of last month.
Back to work: Also during the day she joined her sister Khloe at Barnes & Noble in Calabasas, to meet fans and sign their book Kardashian Konfidential
The reality show star first revealed the news in an issue of Us Weekly.
The older sibling of Kim and Khloé told how she woke partner Scott up at seven o'clock after taking a positive pregnancy test to share the news.
And Kourtney was so excited, she couldn't wait the traditional amount of time before sharing it with the world.
Beaming: At the event Kourtney appeared perkier
In an episode of Keeping Up With the Kardashians in July, Kourtney was seen clashing with mother Kris Jenner after she mentioned that she and Scott were considering trying for another baby.
While their first child Mason was a happy surprise, the family matriarch is adamant that the couple should be married before thinking about expanding their family.
In the episode, Kourtney is insistent that she will marry if and when she chooses, and admits the reason she is hesitant to walk down the aisle is because she doesn't want her children to go through a parents' divorce they way she did as a child.
Surprise appearance: Making a surprise visit for the occasion were younger sisters Kendall, pictured, and Kylie Jenner
During their stint in Miami last year, Kourtney ordered Disick to leave her and their son alone after he turned violent and smashed a mirror, telling him 'I love Mason more than I love you.'
Scott has since worked out his issues and has said he has no problem marrying his long-time love.
He even proposed to an unimpressed Kourtney in the final episode of last season's Kourtney and Kim Take New York.
Family: Kourtney is seen here over the weekend with her partner Scott Disick and their son Mason, who turns two tomorrow
And headstrong Kourtney has clearly decided not to fulfil her mother's wishes to get married before falling pregnant again.
'It wasn't like we weren't trying,' Disick says. 'We kind of just said, "If it's meant to be, it'll be.'"
Following the baby news, Kourtney's sister Kim tweeted her excitement.
'This is such a blessing and the whole family is beyond thrilled!' she wrote. 'I just know Mason will make the best big brother and I can’t wait to meet my new little niece or nephew!
Thrilled: Kourtney out and about just a day before announcing her big pregnancy news at the end of last month
Teen sister Kendall also tweeted her excitement about the news.
'My sister's [pregnant again!!!!' she wrote. 'Congratulations @KourtneyKardash and @ScottDisick!!!! You guys will make great parents...AGAIN! :)'