Should I trust my OBGYN??help please.

Ever since I turned 18 weeks am almost 30 wks now in pregnancy my vaginal discharge has changed to light green but no smell and i dont itch at all ,,I brought it up twice to my obgyn in my appointment but she insisted as long as their is no odour and I don't itch that's normal.is it normal really??Should I trust her and stop working myself up?