evening primrose

Im on my 35th week of pregnancy. May OB prescribed to insert 3 capsules of evening primrose in my vagina every 8 hours for 7 days. May kapareha itong buscopan pero dko pa ginagamit kase nagddoubt ako dahil ang alam ko e pag full term n ung baby ska lang pinapagamit nun. Ano po need ko gawin?tama po b si OB?