start of mucus plug?

Elizabeth • 28, married (4.6.13) ....mommy to John (11.3.14) Blighted Ovum (D&C 12/3/15) - baby #2 due(3/30/16)
Having mucus that has a tinge of green.. 38w2d .... could this be the start of my mucus plug? I have a section sched for this friday (39w1d) so im not sure if i should call OB tomorrow to let her know or just let this run its course