If you never had a delayed period in the past and if you are not on any type of contraception
, then it is most likely that you could have conceived. Nausea after eating could be due to various causes and early morning sickness
is the symptom of pregnancy
. Chlamydia does not cause such symptoms. You may repeat the HPT after a few days or go for the blood test
as urine tests are not so sensitive in detecting low hCG values. I advice you to see a gynecologist for further advice. Take care.