Thanks for writing in.
Sometimes periods can get delayed if you are stressed , anxious etc. I would advise you to wait for a week and repeat the urine pregnancy
test. If it is still negative, you could do a serum Beta hCG
test to check for pregnancy.
It is also possible that your present brown discharge with cramps and leg pain , might be the onset of your periods.
However, In the presence of severe bleeding per vagina or severe lower abdominal pain
, please visit your gynaecologist .
Hope this helps.
Dr. Divya Kuttikrishnan