First of all, trans women need a couple routine check-ups. To some degree, they are the same check-ups cis women are recommended to do. Yes, most trans women don't have a cervix or an uterus, but you basically don't know and it's not your business. There are intersex people. Also, it doesn't matter too much whether there's an uterus and/or cervix or not. What matters is whether there are cancer cells or not. Early cancer detection can be live-saving.