I had my last periods on 18 august, after menses I was diagnosed with vulvovaginitis since 25 august I'm taking its treatment. It was resolved within 2 3 weeks and my periods date was due on 20 September this month but it skipped. I've missed period for the first time in last 4 5 years. I took pregnancy test 2 times both was negative. Few days ago I witnessed yellowish green discharge and showed to gynaecologist, she has again started medicines for vulvovaginitis without doing physical examination and told me to wait a week and then have an ultrasound. She didn't prescribed me medicine for periods. I'm quite confused that why did I miss my period because pregnancy test was negative and why is my infection reoccurring?