test have to be read within 5 minutes. If read or positive after 5 mins then they have no significance.
If you are 2 weeks late and always had a regular 28 days cycle in the past, then had you been pregnant, your test would show positive result.
I suggest you to repeat the test with a fresh early morning urine sample.
Read the kit after 5 minutes. Do not keep it longer.
If negative, then it means you are not pregnant.
You can then consult a gynecologist for an internal examination followed by use of progesterone tablets
for withdrawal menses.
might be required depending on the findings of your internal and physical examination.