Hello there we understand your problem and your concern. But then if the bit has failed once that might be because if the unfavorable co.edition if the mother's womb. Or it.might be the error that done by doctor or it might be familial that it is happening this way. Cannot say anything ad why it is happening without examination. Just consult an another gynecologist for thus and get it sorted out and. Keyhole that yo next attempt will be a success. Thank you.