PLEASE do NOT sweat your refill. They always run out after 3 or 6 months. The only reason they do that is to insure your seeing the doctor and getting regular labs done. All that will happen is they will call it in. Your doctor will probably ok it for a month (Because you have pending labs / visit) and you will get a new dose and new script updated with your next level whatever that is. I'm 99.999999999999995% Positive your doctor is NOT going to cut you off. That would be really bad. Once you go on HRT its normally for life be it TS or Guys like me.
There is a chance that the Doctor will have the new labs on her/his desk and will phone back your new dose. Its possible (probable) they will want to talk to you first to make sure your not having bad symptoms from your current dose.
Get on the phone to your Pharmacy and get them jingling your doctors office asap. My advise with hormones is first...
Never let them run out! Going cold turkey SUCKS... And it probably not good for you? I'm not sure. Anyway it sure feels bad.
Always refill as soon as you can. After a few refills you will have a little extra so that you can "forget" to refill and it won't be a disaster.
Ask about doing refills in 90 day qtys. Every month is one more thing thats easy to forget. BTW if you do have 90 day refills I think you can refill a week or more early. Check with the pharmacy. Anyway just never wait until the bottle / box is empty...