Jennifer Garner is rumoured to be pregnant with Ben Affleck's fourth child. The Miracles From Heaven star's pregnancy news comes at a time when the couple are believed to be working towards rekindling their romance after their split in 2015.

"Jen [Garner] and Ben [Affleck] conceived the baby while he was working on Justice League in London," a source told OK! Magazine. (via Inquisitr)

"He and Jen had begun spending more time together romantically and Jen realized there was still a lot of love between the two of them," the source added.

Reports suggest that the 44-year-old actress has been sharing the news with people close to her.

"[Garner told] her inner circle that she's having a baby and that she's happy about it," the source was quoted as saying by the celeb gossip site, adding that The Batman vs Superman star is "over the moon" about his chances of rekindling his marriage with Garner.

However, Garner is said to be "cautious" about the possibility of reuniting with Affleck considering the drama surrounding their split and divorce talks.

"She isn't ready to do that [reunite as a family] just yet...She just wants to see if Ben is able to keep his promises," the source said.

Earlier, it was speculated that Garner was mulling over getting back with her estranged husband following their reunion in England.

"Jennifer followed Ben to England and the trip has given her a whole new outlook on their future. She still feels conflicted, and she's only telling close friends that she's started to open up to the idea that they could get back together. She thinks they have a long road ahead of them, but Ben is already proving to her that he's committed to changing," a source had told The Mirror.

The ex-couple were married for 10 years and share three children: daughters Violet, 10, Seraphina Rose Elizabeth, 7, and 4-year-old son Samuel Garner Affleck.