Thank you for your query.
It is IMPOSSIBLE to make the UPT come negative when you wish.
That is not going to happen.
For your medical fitness,you can prove that you are not pregnant, by taking a blood B HCG
Or you can go for a transvaginal ultrasound
BOth would tell you that you are not pregnant, provided the MTP
The UPT would take a while to come negative, nor is it reliable to prove success of an abortion