Is rephresh vaginal gel a good alternative for pregnant woman who want to cure their bv naturally rather than metrogel?

Probably not: RepHresh gel has not been studied for its effect against BV, but almost certainly would not be effective. Metronidazole by mouth is the treatment of choice, in both non pregnant and pregnant women. Vaginal metronidazole (MetroGel) is not nearly as reliable, but maybe worth a try. But I would suggest not wasting time, energy, or money on RepHresh. Discuss w/ your obstetrician. Good luck!