The results in three of Thursday’s primaries were so close they could trigger recounts if the losing candidates request them by Monday, Secretary of State William F. Galvin said.

The races includes contests for Governor’s Council, state representative, and the US House.

In the Governor’s Council race, only 142 votes separate Oliver Cipollini, winner of the Democratic primary in the First District, from Nicholas Bernier, the second-place finisher, according to the secretary of state’s office. Bernier said Friday he was unsure whether he would seek a recount.

The district he wants to represent includes communities across Southeastern Massachusetts and the Cape and Islands.

If Bernier does not seek a recount, Cipollini would face a rematch in November against his older brother, the Republican incumbent, Charles Cipollini of Fall River, who defeated Oliver to win his seat in 2010.

The brothers, despite their party differences, say they share the same views and help one another in their campaigns.

In the congressional race, only 39 votes separate Adam Chaprales, a 28-year-old financial services manager from Barnstable and the winner of the Republican primary in the Ninth District, from the second-place finisher, Chris Sheldon, a 34-year-old business consultant from Plymouth.

Sheldon could seek a districtwide recount if he submits 500 signatures by Monday, Galvin said.

Sheldon said he was not sure whether he would seek a recount, but he said he might ask volunteers to gather signatures over the weekend, to keep his options open.

Chaprales and Sheldon are vying for a chance to challenge the Democratic incumbent, Representative William R. Keating, in November.

In the Democratic primary for state representative in Fall River, the challenger, Alan Silvia, a former police officer, defeated the incumbent, Kevin Aguiar, by just seven votes. Aguiar could not be reached for comment, but Silvia said he expected there would be a recount, given the narrow margin.