Thanks for the query.
As the choriodecidual reaction is week and you are having spotting in-spite of using all the medicines the possibility of miscarriage
cannot be excluded.
But you once consult gynecologist, get examined and go for ultrasound
to find out the actual status of the fetus.
If the gestational sac
and fetal heart rate
etc. are in normal condition there is possibility of continuation of pregnancy.
Meanwhile continue the medicines prescribed to you and take sufficient rest.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429