First of all, you do a blood test
for beta hcg & USG lower abdomen to exclude intrauterine pregnancy as brown discharge with late period may indicate implantation
In exclusion of pregnancy, other reasons are hormonal imbalance, stress/ anxiety, thyroid problem, wt gain/extreme loss, irregular eating habits etc. Vaginal infection
is also to be ruled out.
Do some investigations to rule out underlying pathology like Thyroid profile & other hormone assay etc. One vaginal swab test & urine examination are required. So consult with your doctor and take suggestive measures.
Avoid stress, take healthy diet with folic acid
& vitamin supplements, control body wt and maintain genital hygiene properly. To get relief from abdominal cramp
, you may take some anti spasmodic medication.
If you need further consultation with me, then you can visit http://www.healthcaremagic.com/doctors/dr-soumen-patra/63326.
Take care yourself.