Can I do FP before the Scheduled date?

My wife got Finger print notice and the schedule date is Sep. 18, but she is going to labor around Sep. 20. We are planning to go earlier next week. Did anybody have same experience before? Can CIS accept to do FP for her earlier?

We are in Los Angeles, CA. The CIS local office is in 888 Wilshire blvd. of Downtown. Please Share your information. Thank you very much