hi,you may be pregnant,as the urine pregnancy
test you have taken may be too early.repeat urine pregnancy test once in 2days for 1 week or do serum b hcg
test to conclude if are pregnant or not.only history which is saying that you may not be pregnant is reddish discharge with cramps.get a pelvic ultrasound
to confirm findings along with good gynaecologist consultation. wish you good luck.