If you are biologically male, trans but still have the male reproductive organs, and not use any form of protection such as condom or birth control... then yes, you can get a woman pregnant.

If you are trans male, who was born biologically female, then I don't believe you can get a woman pregnant. You will have a penis and a sac, but I think it's all "blanks" as far as I know.

Edit: "Without a testicle transplant and a functioning ejaculation system transplant, which I have never heard of, it would not be possible for any typical trans man to impregnate anyone by sex alone." - Source