First of all, no drug should be taken without doctor's prescription. Secondly, before taking MTP
pills, a scan is compulsory, and not just UPT , to rule out ectopic pregnancy
There can be other causes of amenorrhea
too, apart from pregnancy.
Even if we consider that you had a pregnancy which got aborted with pills, you need not worry now as UPT is negative, and you dont have any bleeding. But if you are too anxious, get a scan done, between 7 and 10 days of abortion
, to rule out retained products of conception.
We dont know the exact cause of your bleeding. If it was your periods, then pregnancy now is less likely.
Pregnancy or no pregnancy, a scan will give the answer.