Hi, thank you for asking Healthcare Magic. Actually, the time interval during which the pregnancy test turns negative after an abortion varies. Generally, it takes 3 to 4 weeks and might go up to 6 weeks. Given that your wife has been bleeding for 45 days, I think there is something that needs to be investigated. There might still be parts of product of conception left in the womb (incomplete abortion). She needs to do a pelvic scan to verify this. I would suggest you see a doctor for proper assessment. Also, taking into consideration that she has been bleeding for 45 days, it could be possible that she might be having blood shortage (anemia). I hope that helps I wish her good health