Regarding pregnancy. Where it comes.

We are facing some different kind off problem actually in January we had unprotected sex and then we take unwanted-72 but in January she didn't have her proper periods and from February she Start's bleed heavily so we take one ultrasound for making sure is she pregnant or not but it shows then after some days we again do ultrasound and this time again doctor said she's not pregnant and they give her birth control pills for 21 days and now after 21 days when she stops taking medicine then suddenly dates comes and day before yesterday she feel heavy pressure and one futus comes out we are very surprised from where it comes and how because in ultrasound they said nothing is in ovary now we don't know what to do she feels good now but we wanna a doctor so that we should know what is happened and from where it comes.