Though Gretchen, 35, wanted to have a baby naturally, it wasn't in the cards for the couple, who got engaged over a year ago.
Slade, 40, told OK! magazine he “felt guilty about the fact that Gretchen wasn’t able to conceive the way she had envisioned,” but have made a decision as a team to try another method.
The Real Housewives of Orange County stars agreed to give OK! an exclusive look at the process in a three-part series.
For more on the story, pick up the latest issue of OK! magazine, on stands now.