Kim Kardashian and Kanye West may consider pursuing a surrogate to have another baby if other fertility options don't work out, a source reveals in the new issue of Us Weekly Credit: Taylor Hill/Getty Images

There are a lot of ways to grow a family, and Kim Kardashian isn't ruling out any of them. After unsuccessfully trying for a year to get pregnant again, the reality star is exploring other options with husband Kanye West — including surrogacy, a source reveals in the new issue of Us Weekly.

Until now, the Dash mogul has been trying to conceive the old-fashioned way — she joked that she and West have sex "500 times a day" — and via in vitro fertilization.

"Kim has been undergoing IVF," the insider tells Us of Kardashian, 34, who welcomed daughter North West, 23 months, in June 2013, after a dramatic, difficult delivery. "It's causing problems with her body."

Indeed, as Keeping Up With the Kardashians fans saw on a recent episode, the star had to undergo a procedure to "clear something out of [her] uterus." And on the May 31 show, she'll reveal that an implanted embryo did not take.

In part because of that, the couple may start to pursue a surrogate in June, the source tells Us, adding, "They will do surrogacy over adoption."

Kardashian hinted as much during an interview with Matt Lauer last month. Asked about her fertility struggles during an interview on the Today show, she said the idea of surrogacy had been recommended to her, but that she and West, 37, were still mulling their options.

"I would like to hold out a little bit longer, and still try," she told Lauer. "I still have hope, so I'm just going to keep on trying. Never say never. I mean, we haven't talked about adopting."

Whatever they decide, one thing is certain: Kardashian wants to give North a little brother or sister, and sooner rather than later. The source says she wants her daughter to have "a sibling close in age...just like she is with her sisters."

For more on Kim Kardashian's baby struggles, pick up the new issue of Us Weekly, out now. Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics, and more delivered straight to your inbox!