With as frequently changing as Transformers continuity can be, its been incredibly difficult to pin down exactly how their biology works. However, one series published by IDW presented a serious, and uncomfortable, fact: Cybertronians can get pregnant. Although this process is not at all what one would expect, the techno-organic concept is relegated to one very specific situation that the franchise has since to readdress.

https://screenrant.com/transformers-can-get-pregnant-idw-canon/