If a girl get a review about giving an STD may as well retire. Prep users are tested monthly

I feel like we qre missing a key point here.

 I didnt see anything in this post about actually protecting yourself.

You ask if the provider is on prep or dozy. But you should be the one on prep and doxy. These drugs are readily available, protect yourself.

Your best bet is to speak with a doctor.  
          PrEP requires testing every 3 months, not every month, it only works with HIV. While there's different variations, the most common and first way it was prescribed is with a 90 day or 3 month supply. Before each refill you need to test negative for everything, not just HIV. If you test positive for anything you are to treat that before you continue with the medication. The testing cycle every 3 months helps someone stay up to date and informed about any STIs they may have.  
          Doxy-PEp (doxycycline) is usually something you take up to 2-3 days after potential exposure to and STI. This works for several other STIs. There isn't a testing cycle for this although it's often prescribed in addition to PrEP. This is newer and there are daily regimes with it also.
          Condoms and lube are still among the most common prevention's against STI's. Condoms for obvious reasons with oral sex and penetration. Lube to reduce the amount of tearing in the anal cavity, tears so small not easily seen by the naked eye where bodily fluids can exchange.  
          Providers are not 100% honest but then you and everyone else isn't either. There is no magical formula or a "I'm clean" card that either providers or clients carry, whether they work as an independent or through an agency. RISK IS INVOLVED, you need to learn how much with the various scenarios and figure out any benefit to risk ratio. Speak with a Doctor and learn what you can online, there are all kinds of accurate and helpful info out there.      

I have found that if you go to an agency, that the ladies are more up to date on things health related.  Though other ladies can take good care of themselves, like Jessyca Ketlen.  You can read my review of her here.  
Some of those places have a catalog for you to choose from.  Some of those places have each lady walk through the room and introduce each of them to you.  Then you tell them which lady.  It is very good entertainment!!!    
Here's one for an example; https://transsecretsbcn.com/  My favorite there is Aurora, formerly Ruby Ferrer.
Barcelona, Spain is one of my favorite places to visit in Europe and has a big selection of ladies, in the Example district!!!  
For travel info I use TripAdviser.com

I would consider getting on PrEP & DoxyPEP. I used to be super paranoid when I wasn’t on it. In my early days of seeing trans girls I was a strict top and didn’t like bottoming, so I used a condom 85-90% of the time. If I topped bareback, a Tgirl had to show me proof she was on PrEP and a recent STD panel. Once I started bottoming I made every Tgirl wear a condom—some don’t like them, but I was strict about it. I unfortunately had two experiences where Tgirls who topped me took the condom off without me knowing and fucked me bareback. Luckily I came back clean, but I was so paranoid I had to get on PrEP.

 
I recommend all bottoms/vers get on PrEP. Unfortunately there are Tgirls out there who will try to take the condom off and get a few strokes in bareback, with or without your consent. It’s hard to verify if they’re clean or not, although some Tgirls don’t mind showing their PrEP bottles and STD panels (make sure names match). If you’re a strict top and always wear a condom it’s not necessary, but if you like barebacking a lot then definitely get on PrEP.