A thin discharge with a fishy odour and little or no itching is a fairly typical description of a bacterial imbalance in the vagina rather than a yeast infection, which usually itches and produces a thicker white discharge. The distinction matters because the treatments differ, and treating the wrong one is why these problems often recur. It is confirmed simply, with an examination and a swab.
Next Steps
Please book a gynaecologist appointment for an examination and a vaginal swab. Go without douching or using any intimate wash beforehand, as that can wash away what the test is looking for.
Health Tips
Stop using intimate washes, douches and scented products in that area entirely. They disturb the normal vaginal bacteria and are a frequent reason this keeps coming back.