My daughter is 17. she started her period at 15. she bled for 3 month's straight. i took her to the doctor's and put her on birth control pills which made her stop. ok, good. but then she never got her period again so we stopped the pills. got her blood checked and that came back good,so my thing is what could be stopping her from having it? she's never had a regular period. one month she did bleed and after that nothing.