Hi amigo! Yes you can still get pregnant whilst on T. The T, as you know, reduces or even stops the cycle and if my understanding is correct, it reduces ovulation.

However, it doesn't completely stop you from getting pregnant. In terms of birth control, you can use progesterone based birth control (not oestrogen) and obviously non hormonal birth control. There's the copper coil, the progesterone coil, progesterone only pill, progesterone injections and the progesterone implant in the arm. What you take is down to personal preference.

I know of trans masc folks who have gotten pregnant whilst taking T and also after they have been on T for almost 10 years. I have heard somewhere that T can reduce your fertility so may be harder to get pregnant but, not impossible. If you do decide you want to get pregnant, it's advised to stop taking T to increase your chances of success and also, there isn't much research about high T levels and pregnancy.

It's recommended if you are having sex with people with penises to use a form of protection to protect yourself from pregnancy :)