I had sex 1 day after my last period; the night i had sex i had a ruptured ovarian cyst. now, after 4 weeks, my period is late. is pregnancy possible?

Maybe. Maybe not.: Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, vaginal spotting, or medications. A test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period. If worried and still no period after another 7 days, one can repeat a urine pregnancy test one more time.