welcome to healthcare magic
brown discharge is always sign for pregnancy
but u didnt specify from how many mnths u didnt got menses.as ur using oral contraceptive pills
there is less chances for u to concieve and you should be aware of its side effects.and if your not menstruating than its not good for your health.consult good gynaecologist.
and if you have doubt go for pregnancy test done at home and than consult gynaecologist.