A pregnant 18-year-old was shot in the arm yesterday at her Lower East Side home, police sources said.

Kimberly Velasquez, who is two months pregnant, was rushed to Bellevue Hospital after being wounded at around 2 p.m. in the building on Stanton Street, sources said.

Witnesses said her boyfriend was playing with the gun when it went off, according to the sources. Cops were still searching for him last night.