This is highlighted topic in AMBOSS and there is a table in UW about the same thing so i feel it's important to focus on it
"Indications for GBS prophylaxis
History of early-onset GBS infection in a previous newborn
Documented GBS colonization during the current pregnancy, i.e.:
Positive GBS culture
GBS bacteriuria
Unknown GBS status in current pregnancy PLUS any of the following are present:
Any maternal risk factors for neonatal early-onset GBS infection
Imminent preterm delivery < 37+0 weeks' gestation or PPROM
Prolonged rupture of membranes
Maternal temperature ≥ 100.4 °F (38.0 °C)
Positive intrapartum NAAT
Positive GBS status ; in a previous pregnancy"
Maybe you can change the disgn if you want
Source: AMBOSS - https://next.amboss.com/us/article/RN0lag?q=GBS%20prophylaxis#Zbc95ed998d72a07f22e4b09edd675e50