Yesterday evening I was getting changed and I could smell something really strong and it was my underwear. There was no discharge either, but they smelt really bad. I searched it and it might have been a ammonia smell, but I don't know what that smells like. The only things that I can think of that might cause it is an infection, the contraceptive Pill (combined pill but I am yet to have sex in my life, I only do smaller things with my boyfriend such as fingerings and me giving him blow jobs and hand jobs) and the fact that my period is 3 days away. Any ideas??