i just found out that i have BV (bacterial vaginousis)

050809nandf

i went to my first ob appointment yesterday, and everything was fine- except i found i have bv. they told me i couldnt take anti biotics, since im pregnant, but to take probiotics, and every three days wash with tea tree oil soap. im worried that during the 2nd or third trimester, it will cause me to have preterm labour, even if i followed these steps. do you think everything should be fine if i follow these steps?