since there is no history available from you of the 5 months period in between the two D&C , i assume that you had normal cycles, until you conceived again.
zitotec has misoprostol
used for medical termination of pregnancy
medical termination is not a full proof method for termination.
most of the times the bleeding continues for more then 5 to 7 days due to retained products of conception. so the next step to be followed is D&C .
if the bleeding continues it is much much more harmful then D&C.
so in the present situation you have to undergo one D&C to stop bleeding.
following which you can choose from the wide array of contraceptive
methods, as frequent and repeated D&C is very harmful and decreases the chances of conception.
take care of your self.