thanks for your query.
On day 5 of cycle, the chances of conception are quite low, and you also took the emergency contraceptive pill
As your pregnancy
test is negative, you might be having pre menstrual symptoms, due to a late period, which often happens after taking hormonal
Another possibility is some gastrointestinal infection
which is causing bloating, and nausea.
To know the exact cause and the status of your periods, you should see a gynecologist for a check up.