White discharge. Something is wrong.

This discharge wali problem started with my chicken pox in may, i thought it's happening because i had chicken pox all over my body, including parts down there. By june it happened whole month then in july-august it happened before and after periods. Fir September se it's happening just after one week of my periods. The discharge is bloody on the first day when it starts after periods, rest of the days it's transparent. The problem is amount of this discharge ,it's long water like and  constant and the heaviness i feel after one week of my periods because of this discharge. Also, There's a little pain  sometimes in my stomach or pelvic area. According to the gynae it's normal in mid cycle and she asked me to get a ultrasound done for clarifying doubts,refused to use the tool because I'm unmarried / not sexually active but it never happened to me in this much amount since my periods stafted in class 9th till now and with this much disturbance so i doubt if there's something is wrong .