Hello, I would be happy to help you with your question.
It is not uncommon for emergency contraception
to significantly delay ovulation and this is experienced as a significant delay in your period. This can obviously cause concern for pregnanct, but if it has been more than 2-3 weeks since your last episode of unprotected intercourse
AND the test is negative, then you are NOT pregnant. Talk with your doctor about ways to 'induce' a period.
I hope that this helps. If you have more questions, please click on "ASK ME A QUESTION" link above to directly ask me a question!