I am 25 weeks pregnant and recently started having a light greenish discharge with a consistency like snot. I just had my 4 week visit with a midwife and she said that as long as there is no odor, itching or burning this is normal and there is nothing to worry about. However, I am doubting her medical opinion because everyone else is saying this is a sign of infection. She took a swab sample and tested it on a piece of paper. Not sure what the test is called. It turned light green which is supposed to be normal. I feel uncomfortable with her diagnosis. Should I seek a second opinion from my regular ob/gyn?

Yes, by all means get that second opinion. Greenish discharge is not a normal color and can signify several different things including infection.