After getting the splint off, my nose is getting bigger after Rhinoplasty?

The size of your nose is most likely affected by swelling at the moment. Swelling is common in the months after surgery, and will gradually subside. Keep your head elevated to keep swelling to a minimum. You should sleep with your head slightly elevated as well. 

It’s not unusual for patients to note swelling when their nasal splints are removed.  The presence of a splint molds the nasal bones in place following rhinoplasty.  It also helps to diminish swelling.  For these reasons it’s not unusual for the nose to suddenly swell when splints are removed.  It’s important to realize that this swelling is normal and resolves with the passage of time.

            Most patients will note significant swelling for about two to three weeks following surgery.  After two weeks, most patients are able to resume their normal lives and go out in public.

            Swelling will persist in most patients for at least one year following surgery, with the nasal tip being the last site to experience resolution.  In the immediate post-operative period, nasal splints, elevation of the head and ice can be used to minimize swelling.

            It’s important to maintain good communication with your plastic surgeon.  Your surgeon should be able to reassure you and alleviate your anxiety.

Be patient. Rhinoplasty results can take time to become apparent. The amount of swelling and how long it persists after rhinoplasty depends on several factors such as the surgeon's technique, open versus closed approach, whether the nasal bones were broken, and the number of prior nasal surgeries.
Patients in whom open rhinoplasty techniques were used, cases in which the nasal bones were broken, and a history of one or more previous nasal surgeries often will have more prolonged swelling.
The nose will look swollen or puffy for sevearl months and it usually takes a full year for the final result be apparent.