No, not really. Don't brush your teeth before you give a blowjob as this can cause micro-tears in your gums which are an entry point into the bloodstream. Even if you swallow cum you wouldn't be able to contract HIV from it even if someone has it, unless you have cuts or sores in your mouth or a stomach ulcer or something. Swallowing is actually safer than spitting because the cum doesn't have to contact your gums, which are the most likely part of your mouth to have micro-tears. And stomach acid will denature everything and kill it, so just because it's inside your body doesn't mean it has access to your bloodstream. But also, vaginal fluid also can contain HIV so that thing about not brushing your teeth before a session is a good rule for pussy eating too. You never really know if someone is positive or not so best to just have good safety practices in general. That's my rule of thumb anyway!
Some people think transgender women are more likely to have HIV but this is a false idea based on societal stigma, much like the idea that sex workers are more likely to have HIV, also false. It's true that trans women are disproportionately subject to violence (statistically) and sometimes have trouble accessing preventative resources due to social stigma, but if you are seeing a reputable and/or professional lady who is running her own business, she probably has her health and safety as a priority just like most of us cisgender (non-trans) ladies do. There are exceptions to that on both sides, of course.
Be sure to have the lady use a condom if you get fucked. Silicone lube is a great recommendation. Silicone lube does not kill HIV but a well-lubricated experience is less likely to irritate your rectum, which would leave you more vulnerable to contracting something from micro-tears (which expose your bloodstream). But if you're using a condom, that wouldn't be an issue anyway. But condoms are also extra friction-y when you're getting fucked, so don't tempt yourself to bareback by forgetting to bring some nice lube.
Female condoms also work great for receiving anal sex. Just be sure to take the ring out (which is meant to line up with the cervix) if you're using it anally. And use lube on both the inside and outside of the condom. More lube on the inside than the outside.
And remember, transgender women ARE normal women. They're just not cisgender. Respect them by not referring to them as "abnormal"!
And have fun!!!