Is 3 months a long time to be on provera (medroxyprogesterone) without clomid ?

Depends on why: Provera (medroxyprogesterone) can induce bleeding if you have irregular cycles / no periods, and may be given for months to treat endometrial hyperplasia (abnormal uterine lining). If you're ttc Provera (medroxyprogesterone) will not help you to ovulate or get pregnant - see your ob/gyn or a reproductive endocrinology and infertility (rei) specialist to find out why you're not ovulating, and for treatment like Clomid or Letrozole if needed.