Talk to Gynecologist on LMP Or Pregnancy

Asslam o alikum Dr Me and my husband had unprotected intercourse a month ago ( on 9th may and my periods was expected on 11th may ) , we used pull out method but i had a doubt that semen did go inside so i tool ecp ( 2 tablets) within 48 hours . And got my periods on expected date which is 11th may ( i can tell it was periods not irregular bleeding because it had clots and it soaked 3 pads , heavy bleeding lasted for 4 days and then spotting for 3 4 days , now this month my periods date has passed i was cont. Doing home strip test to monitor it . Test didn’t show up positive not even a single time now I’m 4 days late and did my test this morning on first urine and still negative . Is there any chances Of me being pregnant ? Does ecp has to do something with my late periods ? Or I’m stressing too much? I’m not feeling any other symptoms I only feel nauseated when i stress about it.