Thanks for the query.
Sometimes urine pregnancy
test kits may not detect the early pregnancy.
But just by symptoms we cannot confirm or rule out the pregnancy.
So you can go for blood test
for pregnancy now or wait for few more days and repeat the urine pregnancy test.
Depending on the result you can proceed further.
Start taking folic acid
prophylaxis from now-onwards.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429