The Hole frontwoman said in new HBO documentary Kurt Cobain: Montage Of Heck: "I used it once then stopped. I knew she would be fine."
Love's battle with substance abuse is well documented, but this is the first time that she has admitted to using the drug while pregnant with Frances, who is now 22.
In the documentary, Love says that at the height of his fame with Nirvana, Cobain wanted to "stay in their apartment, do heroin and paint".
Love has previously said that she first tried heroin aged 16 after mistaking it for cocaine while working in a dance hall in Taiwan. She quit her addiction in 1996.
The documentary was shown at the Sundance Film Festival, and looks at the Nirvana singer's early life up until he found success with the band.
Frances Cobain was executive producer of the film and walked the red carpet with her once-estranged mother.
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