Thanks for the query.
There is very less possibility for pregnancy
in your case, as:
-In case of regular periods ovulation will not occur on 7th day usually.
-It was protected intercourse
-You took emergency pill.
Emergency pill can alter the menstrual cycle depending the period when you took it. As you took it in the first half of the cycle it preponed your periods.
Now as your regular cycle got disturbed it may take sometime for re-regularization. Better to wait for one more week. Avoid stress
, as that can also influence the cycle.