Had 2 emergency contraceptive pills on 18 & 25 may. had 3 day bleeding 31.5 to 2.6.17. since then nauseated & gassy. when will nausea & gas subside?

Can't say for sure.: Potential SE’s w emergency contraception: tender breasts; changes in menstrual flow (spotting, bleeding, early or late period or spotting instead of period); loose stools; dizziness; headache; nausea/ vomiting; abdominal discomfort or feeling tired. If you develop chest tightness, difficulty breathing, swelling of lips, mouth, throat – call 911. Notify your GYN if your period is 7 or > days late.