Withdrawal bleeding and ecp. I take it?

Hello Doctor. I have a query, my period started on the 17th of April and lasted till the 25th of April . On 27th of April I accidentally rubbed my vagina  when my fingers had some precum on them. I took an emergency contraceptive pill within 24 hours of the incident. And on the 2nd of May I got withdrawal bleeding for the first 4 days the flow was good and had clots and then for the last 2 days flow was receding, withdrawal bleeding continued for 6 days in total . And my period cycle is regularly 30 days . I am not stressed if there is a possibility of pregnancy . Now I have to count my periods from the date of withdrawal or the previous date? And if I have to take a urine pregnancy test when should I take it? Thanking in anticipation.