Unprotected sex on period took next choice 4 days after. cramping several days after now heavy bleeding 18 days before period. pregnant? miscarriage?

Maybe: Next choice and Plan B work best if taken within 24 hours. Waiting 4 days in general is not advisable. And of course using a condom is even a better idea. It could be breakthrough bleeding from the use of Next Choice as well.

uncertain: I haven't been able to determine the timing involved. Chance of becoming pregnant is lower during menses. Emergency Contraceptive was taken outside the window for good efficacy.