Thanks for the query.
As both your blood and urine tests are negative there is less possibility for pregnancy
Ectopic pregnancy can also be diagnosed by these tests.
There may be any evidence of infection, for which they might have kept you on antibiotic therapy.
So after completion of the course, you once again consult your doctor and if the infection subsided completely then you can go for treatment to have children.
You have to plan unprotected intercourse
around the time of your ovulation, which will increase the possibility of conception.