When should you call my doctor if you find something in your breasts?

Anytime. If you find a lump in your breast you should always consult your physician.
Anytime. Anytime you find a lump in your breast that persists for more than a few weeks you should be examined by a doctor.
Immediately. If you perform weekly exams as indicated you should always note a significant change and point this out to your physician. Exam and x-rays will help ensure your breast health and protect you against the development of disease.
Recheck after period. It is common for young females to feel breast lumps that vanish after menstruation. If you feel persistent bumps, that remain unchanged after menses/periods--> you should see a doctor. If you have a family hx of breast cancer, more of a reason to see a doctor.