Three children were shot; their injuries, however, were not life-threatening, the report said.
The gunmen, who have not been identified, burst into the house in Colerain Township, outside Cincinnati, on Saturday evening, not long after the pregnant woman revealed she would soon give birth to a boy, according to the Cincinnati Inquirer.
Police said two people walked in and started shooting.More news: Wimbledon 2017: Johanna Konta rejects 'favourite' tag
Among the victims in the Colerain Township shooting was a pregnant woman who lost the baby after receiving a bullet to her leg, a family member told NBC affiliate WLWT.
No information was immediately released on what led to the shooting.
The partygoers were watching a movie when gunfire rang out, police said. There is no one in custody at this point, and police are working on investigating the case.More news: Hamilton handed five-grid penalty
"You're hoping that there won't be situations like this", Love said. "There was little kids hurt and everything". The shooter or shooters ran away and haven't been caught. I was sitting in my auto.
A hospital spokeswoman told FOX 19 two adults were taken to University of Cincinnati Medical Center, where one is listed in critical condition and a second is considered serious but stable. These are the nights that you look back on and you regret that they ever happened. "I looked outside, next thing I know they just ran in and just started shooting". The shooter fled the scene and has not been caught. "This will be one of those nights".More news: Shia LaBeouf Somehow Got Arrested for Public Drunkenness in Savannah, Georgia