Welcome to HCM,
Your period came on 17 th of may and unprotected sex on 22 may as only 3 days after period is usually safe period but you took emergency contraceptive pill
it is not advisable to take double dose it can cause hormonal
You took hormone pill in early phase hence you had withdrawal bleeding.
Emergency contraceptive pills are hormone tablets and can cause irregular period.
If there is any doubt it is better to visit a Gynecologist and get examined and if necessary get ultrasonography
of abdomen to be sure any thing is not missed.
Please practice safe sex
as it prevents both unwanted pregnancy
and sexually transmitted diseases.
Hope this helps you.
Dr.Akhilesh Dubey M.D.