The consummation, or the first time you have intercourse, results in tearing of the hymen
, the membrane that covers the vaginal opening and this results in the pain and also some spotting. Some amount of cystitis
is also seen after the first intercourse. You should see your gynecologist , get a urine test done, and take treatment. Brownish discharge indicates old bleeding and since you are still bleeding, you seem to be running a metropathic cycle this time. This could also be corrected once you get treated for other problems. Please get further advice from your doctor. Take care.