Hair color

Thoughts on dying hair during pregnancy?  Not pregnant yet but currently trying.  I have naturally dark brown hair (almost black).  When I was a kid it was wavy and then turned straight as I got older but once puberty hit back to wavy.  Now it's wavy again with no hormonal birth control.  So who knows what my hair will be like when I get pregnant.  My hair is currently blonde and I know my hair dresser is going to kill me if I say lets go dark.