Can't predict.: Plan B can cause both spotting and/or changes in your next period. It is common. Do a pg test if this happens and if it is negative, repeat the pg test in about 3 weeks. Practice safe sex and save yourself a lot of grief, and money. Pick a more respectful partner (unless condom broke). Effective birth control and safe sex should be a mutual responsibility. Consider two methods of protection.
Answered 10/5/2015
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