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If you had sex 2 days after your period , there are no chances of pregnancy
.Moreover , you used condom.That rules out completely chances of pregnancy.You have taken ECP unnecessarily.
You are now facing the side effects of ECP and do not worry.This could be intermittent bleeding due to ECP.
You may even have delay in periods in this cycle.
Hope i answered your question.If you need more information feel free to ask me.