Confused....

Went to my gyno and when i called back a few days later he mentioned that he took a culture and it came back positive for mild case of bacteria and gave me a perscription for amoxacillyn (sp?) To take for 5 days.

My question is....

First what exactly do i have thats wrong? The nurse or whoever i talked to didnt explain very well what i have or what causes it...

Secondly...

is there a natural way to take care of this? I thought i had decent hygine for down there and i dont want it to get worse but i cant afford the perscription till next payday. I have greek yogurt and pinapple juice and have been trying to clean better down there even more. But was wondering if there is anything else i can do to clear it up while waiting to get the perscription??