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There are few symptoms that suggest that you have vaginal infection or vaginal yeast infection (thrush). These symptoms include changes in vaginal discharge color, smell, consistency, and appearance of symptoms like itching, pain, burning, discomfort or pain during intercourse, bleeding/spotting during intercourse etc. If you have any of these symptoms, visit your doctor/gynecologist at the earliest for examination and a vaginal swab/smear test to identify causative agent and start you on appropriate treatment. Drink plenty of water.
If infection is detected, get your partner also treated simultaneously (if you are sexually active) to avoid re-infection. Avoid having intercourse while being on the treatment course.
Take care.