You could say "Tres hermanas embarazadas".
Tres hermanas.
"Sister" in Spanish is "hermana".Hermanahermana..or little sister is hermanita
Say: mis hermanas
las hermanas
"Sisters forever" is "hermanas para siempre".
Hermanas bellas
Hermanas cariñosas.
Hermana favorita
Three in Spanish is "tres".
Estoy embarazada.
You would say "Tengo tres hermanas" in Spanish.
hermanas del alma