Can A Lab Test Detect Pregnancy 1 To 2 Weeks After Taking Emergency Pills?

Can a lab test detect a week or 2 weeks pregnancy ? My period is supposed to show 6 days after today. But i took an emergency pill two times in this month. The first was on the 13th and the second 23rd. Since yesterday, i have not been able to eat. And i dont feel my usual self. A little tired, mild headache