People have been speculating that Meghan Markle is secretly pregnant

Social media is rife with speculation that Meghan Markle could already be pregnant with her first child.

The American former actress married Prince Harry at Windsor Castle on Saturday (local time).

There were several moments during the ceremony when the couple seemed to exchange a knowing look - and they all seemed to be at mentions of family, children and sex.

As the Dean of Windsor said that marriage was "given as the foundation of family life, in which children are born and nurtured," Harry turned to Meghan and smiled.

Meghan also seemed to chuckle when the Dean mentioned the "delight and tenderness of sexual union", although it would probably be hard for anyone to keep a straight face in that scenario.

It was enough for Twitter users to start openly wondering if the Duchess of Sussex could already be expecting her first child.

Some suggested that Meghan's wedding dress looked like it could be concealing a baby bump.

The rumours haven't come out of nowhere - it's well-known that the newlyweds intend to have children together.

During their first interview together after announcing their engagement, Harry told the BBC they hoped to "start a family in the near future".

Andrew Morton, who wrote a biography of the late Princess Diana, told the Daily Star Sunday that he thinks Meghan will be pregnant "before [she's] learned how to spell Leicester and Torquay".

RadarOnline reports that the couple met with fertility doctors in the months leading up to the wedding.

Meghan will be 37 in August, the same age as NZ Prime Minister Jacinda Ardern, who is due to give birth to her first child in June.

Newshub.