It's possible. Cefixime used to be a recommended medication for gonorrhea, but since 2012, the CDC and other agencies have recommended not using it because of resistance.
A shot of ceftriaxone is now the recommended therapy for gonorrhea.
You should go to the doctor and get checked, but any testing you have done might have false negatives since you were on the antibiotics. Get checked anyway - it may come back positive, and you can ask for ceftriaxone. Show your doctor these: