Thanks for the query to H.C.M. Forum.
As you clearly mention that every time you used condom with success , so there is no chance of any pregnancy
The second point is both time home pregnancy tests were negative so no chance of pregnancy.
3rd point is you didn't have any pregnancy symptoms like , nausea
, sickness, heaviness lower abdomen , cramps , dizziness
( no bleeding ) is due to stress and tension so wait for normal menses .
Still no menses for another 1 month then consult a gynecologist and get his opinion.
Good luck. Dr. HET