Hey mama, honestly it's not something you can know agad after sex, kailangan ng time para mag-implant ang fertilized egg sa uterus, which takes around 6-12 days pa lang after conception, at ang pregnancy hormones need time to build up din before any test can detect it. Most reliable would be to wait at least 1-2 weeks after missed period bago mag-take ng pregnancy test, para accurate ang result at hindi ka lang mag-worry ng maaga, alam mo na yan? If you have concerns, better to talk with your OB para ma-guide ka properly on the best timing for testing.