I'm just 19 old girl and having no period from two months and white discharge. urine is dark brown and having blood tissue sometimes. also pain in sto?

No periods: If you have been sexually active (even with contraception), check a pregnancy test. Most common reason for missing periods is pregnancy. If negative, then the irregular blood tissue may be taking the place of your period for this month. Dark brown urine is usually a sign of dehydration, so drink more water. The discharge may be infection, so see a doctor for evaluation.