| Of course it should be realised that even the morning after pill is not 100 percent effective ( a fact not always quoted) and they of course do not protect against any STD.
Only one study has been specifically designed to assess the effects of progestin-only ECPs such as Plan B on bleeding patterns. It found that when taken in the first three weeks of the menstrual cycle, ECPs consisting of 1.5 mg levonorgestrel in a single dose significantly shortened that cycle as compared both to the usual cycle length and to the cycle duration in a comparison group of similar women who had not taken ECPs. The magnitude of this effect was greater the earlier the pills were taken. This regimen taken later in the cycle had no effect on cycle length, but it did cause prolongation of the next menstrual period. The ECPs had no effect on the duration of the second menstrual cycle after use, but the second period was prolonged. Intermenstrual bleeding was uncommon after ECP use, although more common than among women who had not taken ECPs.
You should have another, normal period within the next month. If not, you might consider getting a pregnancy test just to make sure you're not pregnant. | 
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