Chances of phase 2 of DIEP flap reconstruction

Hi all, I am considering doing Diep flap reconstruction after a Mascetomey tissue expanders. But I've heard from other chats that women have had to do "phase 2" of diep flap reconstruction,  my PS hasn't mentioned this. I was under the assumption that if all goes well, that it was only one surgery to transfer tissue to reconstruct the breasts. I am feeling a bit anxious with the chances of having to do more than one surgery and thinking of implants now. I'd love to hear from any women who've had diep flap reconstruction and implant reconstructions. Thanks 😊