Morning sickness, needing a wee every ten minutes and weird food cravings - being pregnant comes with a variety of well-documented side-effects.
But being with child can serve up other, more obscure byproducts, too - such as having more 'sex dreams' than you might be used to.
Writing on parenting website, Romper, Samantha Darby says dreaming about sex while pregnant is a "totally normal occurrence".
There's even a scientific explanation for those nighttime fantasises.
According to website, What To Expect, during pregnancy there is an increase of blood flow to erogenous zones, including the breasts and groin.
Often, the result is these areas becoming more sensitive.
Combined with a rise in oestrogen levels and increased vaginal secretions, this heightened sensitivity can make orgasm-inducing dreams more likely.
Apparently, pregnant women often fantasise in their slumber about doing the deed with a variety of different bed partners.
But it doesn't necessarily mean they're thinking about straying.
The online women's magazine, Bustle, reports that picturing yourself in different sexual scenarios could simply mean you're craving intimacy with your partner.
And the good news is that sex during pregnancy is perfectly safe.
Lots of pregnant women are also reported to fantasise about having sex with other women, even if they've never had lesbian tendencies.
However, Parents Magazine says it might not signal a change in sexuality - it could just be down to a newfound appreciation of the female body.
Finally, pregnant women have been known to dream about sleeping with an ex, something Pregnancy and Newborn magazine says is quite normal.
Experts suggest fantasising about a former flame could mean the woman is seeking closure to make room for her impending arrival.
Generally, Samantha says sex dreams during pregnancy are "based off your emotions about an upcoming adventure".