Jessica Ennis-Hill has withdrawn from Sunday's Birmingham Grand Prix as she bides her time before a possible World Championship bid later this year.
Ennis-Hill made a successful return to action at the Hypo Meeting in Gotzis last weekend in her first heptathlon since winning Olympic gold at London 2012.
The Sheffield star finished fourth and achieved the Olympic qualifying standard but admitted her exertions came at a price.
And after discussions with her coach Toni Minichiello the 29-year-old made the decision not to rush back into a top-level schedule.
Having competed in my first full heptathlon in three years, both Toni and I feel that my body held up well in Gotzis and we are delighted with how I did, but I feel competing seven days later is going to be too soon.
I have missed a volume of training over the past few months, since having my baby, due to problems with my Achilles and there is still a lot of work to do.
So we have made the decision for me to take the usual week off post a heptathlon to recover and then to get back into solid training."
Labour's shadow home secretary Yvette Cooper believes the rape tweets directed at Jessica Ennis-Hill prove why her stance on Ched Evans is so important.
Ennis-Hill received abusive tweets from trolls on Friday after making it clear she would remove her name from a stand at Sheffield United if the club offer the convicted rapist a contract.
The tweets directed at the Sheffield born Olympic Champion are currently being investigated by South Yorkshire police.
Cooper also urged the League One club to "recognise their responsibility to the local community" by resisting the temptation to offer Evans a professional deal.
Olympic gold medallist Jessica Ennis-Hill said she will settle for watching the Commonwealth Games on television as she prepares for motherhood.
The 28-year-old heptathlete will support Team GB from the sofa come July, but admits that she will be rather preoccupied with the arrival of her first child with husband Andy, due the same month.
Ennis-Hill said: "I will be supporting but I will be at home, probably very tired and not knowing what's going on in the world, to be honest.
"I'm sad to be missing it this year but very much looking forward to supporting the team."
Athlete Liz McColgan won a gold medal in the 10,000 metres in the 1991 World Championships, and competed in the New York marathon just a year after giving birth to her first child.
McColgan told ITV News that it could take Jessica Ennis-Hill some time to heal as an endurance athlete, after the Olympian revealed she was pregnant.
Jessica Ennis-Hill tweeted:
We're overwhelmed with all the lovely messages! So thank you all so much! We couldn't be happier. It's a very exciting time.
The news of her pregnancy has come as a big shock but I am absolutely delighted for Jess and Andy. Who knows we may have another Olympic champion! It will be a massive change for her but she has told me she is desperate to defend her Olympic title at Rio, so hopefully that will be the case.
Jessica Ennis-Hill announced that she is pregnant and will miss the Glasgow games.
Double Olympic gold medallist Mo Farah said he might skip the Commonwealth Games to recover from his first London Marathon in April.
World-record-breaking Jamaican sprinter Usain Bolt says he will probably only run in the 200m if he competes at all in Glasgow.
Ennis-Hill, 27 and from Sheffield, who married long-time partner Andy Hill in Derbyshire last May, said in a statement released by her management:
I have some very unexpected but exciting news to share - Andy and I are expecting a baby.
We are completely overwhelmed, with excitement and a degree of anxiety that I am sure all first-time parents will relate to.
My plans for 2014 have been completely turned upside down, but having had a couple of weeks to think about things from a career point of view I am 100 per cent set on returning to full-time athletics once our baby is born and go for a second gold medal at the Rio Olympics in 2016 - that challenge really excites me.
But in the short term I will make our baby a priority and enjoy the whole experience as much as possible.
I am sorry I won't be in Glasgow for the Commonwealth Games, but know it will be an amazing occasion. I will be at home awaiting the arrival of a little Ennis-Hill.
British Athletics tweeted:
Jessica Ennis-Hill has announced she is pregnant and will miss the 2014 Commonwealth Games in Glasgow, Sky Sports News reported.