Is the discharge brownish too? Is it associated with itching or burning sensation?
Probably you have a vaginal infection
and need to be checked for that.
There is a possibility of threatened abortion
You can find it out by a a pelvic sonography
and the next set of Hcg results.
Don,t worry.Take adequate rest, hygeinic food,look after personal hygeine ,visit your doctor soon for the examination.
Meanwhile you can take Pause
MF for pain.