Is cramps and tender breast are symptoms of early pregnancy after taking the plan b?

Ambiguos symptoms: Ambiguous symptoms no longer should be considered in any way as diagnostic for pregnancy. These symptoms are most commonly caused by hormone levels fluctuating. Taking Plan B is taking extra hormones. Thus you have 'fluctuating' hormones. There it is, the cause of these ambiguous symptoms. Your symptoms also do not in any way represent an early pregnant state.