15yrs Of Age-5ft9in; 185lbs; Menses Started @ 10; Period Has

15yrs of age-5ft9in; 185lbs; menses started @ 10; period has never regulated; took pills last year but gained wait so quit; not sexually active yet so not pregnant; last "bleed" was in January of this year. February had clear liquid like bleed post pms symptoms of moody, grumpy and cramps. Again this month and today, same clear like fluid that feels like I'm bleeding but not. currently throwing a 3yr old tantrum! sooo frustrated. made appt to revisit fertility doc next week to reconsider getting back on a different pill?
I'm very active...play vb, bb and track and field - thoughts?