Took ecp on 31st march. period due on 8th april. light bleeding started on 7th april. is it withdrawal bleeding or my periods? is pregnancy test required after either?

Do a home pregnancy test 3 weeks after the episode of sex. If the result is negative repeat the test 4-5 days later unless you get a period by then. Use first morning urine and follow the instructions carefully. If you do not wish to be pregnant, use contraception all the time, every time. Consider implanted contraceptive, or IUD. Wish you good health!