Honestly mama, if your OB said it's an infection, I'd trust their call kasi sila ang nakakita directly and know your full history, better safe than sorry, especially ngayon na malapit ka na sa due date, kasi infections can cause early labor pala. A few of us din nag-experience ng white discharge na "normal" lang parang yeast but turned out may bacterial vaginosis or something, so kung ang doctor mo nag-prescribe ng antibiotics, follow it na; it's better to treat it now habang mabilis pa at walang risk sa baby at sa delivery mo.