Pinkish discharge

actually no symptoms. my gynea says week 36 she plan to check for that, but I checked on week 32. on week 32 I felt sudden sharp pain at lower abdominal and cannot stand straight, I went to hospital, baby ok, the delivery suit nurse say muscle strain can cause that pain, the ward doctor say if there is infection also can have that pain. but I don't have other symptoms, no pain when pee, no itch.