My hemoglobin and hematocrit and rbc did what seems similar to all the others. Increased, I donated 5 or 6 times. Now it stays pretty normal without donations.
Maybe the others will chime in on the lab frequency, but especially if you are new to TRT, 6 months seems too long to go without follow up labs. Also, check your bp regularly and keep a log. You didn't mention your age.