I'm scared. What if I made a mistake? I did a hair transplant at 26 (Photo)

It is quite true that with younger patients, there is a high likelihood that hair will continue to shed. Therefore, it is important for doctors to carefully plan out the course of the procedure. An important consideration would be the amount of donor hair that could be used if additional surgeries (for repair) are needed. If the patient has enough quantities of usable body hair, non-head hair extractions may offer an additional reserve of donor grafts to address the issue of continued (native)hair loss.Due to the sharp angles at which body hair tends to grow, these follicles are prone to damage from regular cylindrical FUE punches. Therefore, it is necessary to choose a body hair transplant specialist who is experienced at producing quality outcomes. 

Mistake or not, what is done is done. If you are bald there may be not much more hair to lose but there may be shock hair loss around the area you have hair.  There may be other issues with your particular case.  In the mean time, follow up with your doctor and follow your doctor's post-op instructions. Results will come in 6 to 12 months.

Thank you for posting your question. There is no reason to be scared that you had a hair transplant at this age. Just make sure you do a proper research on the choosing of your clinic, otherwise its perfectly fine. Hope this helps a bit. 

After only 3 weeks, it is
still very early to evaluate results from a hair transplant procedure. We generally wait a full year to assess
results. There is no firm age, but it is
better to wait until you are older before undergoing a hair transplant so the
surgeon has a better idea of the balding pattern and extent of baldness. This will help in formulating a plan that
will be aesthetically pleasing long term.
Hair loss medications, such as Propecia, are very effective in
maintaining your current hair, thus allowing us to be more comfortable in
performing a hair transplant in someone of your age.

Hair transplant at your age with the degree of your hair loss is very common and it is usually successful. The only thing that you should be concerned about is if you picked right doctor or the clinic to perform your transplant. 

You made the decision and now you have no choice but to wait out the 5-8 months for the hair to grow. If you picked a good clinic and they did a good job, you have nothing to worry about. Be patient and wait. Worrying will not help the hair grow.