Final answer:
An early period after taking Plan B can be a side effect of the high dose of levonorgestrel disrupting the hormonal balance. This, along with missed or late doses of birth control pills, can contribute to an unexpected menstrual cycle. Menstrual flow and timing should normalize in subsequent cycles, but consulting a healthcare provider is recommended if irregularities persist.
Step-by-step explanation:
If your period came 2 weeks early after taking Plan B, it could be due to the high dose of levonorgestrel, the active hormone in emergency contraceptives. Plan B's primary function is to prevent ovulation or fertilization by altering the hormonal balance temporarily. This sudden change can lead to an unexpected menstrual cycle, different from your typical schedule. It's important to understand that emergency contraceptives are meant for non-regular use and can disrupt your normal menstrual cycle when taken.
Furthermore, if you are taking other forms of birth control, such as birth control pills, skipping doses or being late on taking your pill can lead to hormonal fluctuations that might result in ovulation and a subsequent early period. Following the instructions on birth control methods is crucial to maintain a predictable menstrual cycle and to effectively prevent pregnancy.
Lastly, the early arrival of your period could be a side effect of Plan B, as changes in menstrual flow and timing are common after its use. These changes should normalize over the next few cycles, but if they do not or if you have concerns, it's advisable to consult with a healthcare provider.