Plagiarism ?
"A young woman pretends to be pregnant in order to avoid being fired from her job."
Good idea, too bad it was already done 8 years before, in an HK movie, "Dummy mommy without a baby" with Miriam Yeung :
http://www.youtube.com/watch?v=rZggd_MoMDM
Didn't watched "Labor pains" and doubt I will, since the HK movie was already very funny and that I'm tired of all these poor U.S remakes they keep doing for several years now...