Diflucan?

About 2 months ago my OBGYN said I had to not only use Monistat, but Monistat7 (ugh), for a yeast infection.  Now, at 28w, my PCP gave me an antibiotic for sinusitis, which gave me another YI, for which they said I could take Diflucan (instead of my proposal to cut the antibiotic short).  It's listed as a Class D.  Anyone take this while pregnant?  The diflucan is waiting for me at the pharmacy but my OBGYN is closed.