She should not be denied because she is pregnant but you are cutting it close in terms of time. I suggest hiring an attorney immediately and filing the application ASAP. In certain cases it is faster to complete a K-3 visa application. My firm's turnover on this type of application, assuming all the evidence is submitted by you is less than two weeks and because of your extraordinary circumstances we could probably expedite it and have it in for you within a week. For a free consultation, give me a call.
212 537 4407