Subutex and Pregnancy? Do you have to increase your dose?

I've been taking Suboxone for a while now and am now taking 2mg and was about to start tapering when I found out I'm pregnant. My doctor switched me to Subutex and said I will have to increase my dose as I get further along. I really don't want to go back up since I was just about to try to taper off. Does anyone know if I can just stay at 2mg my whole pregnancy or even better still taper and be off completely???

: http://alcoholdrugstreatment.info/subutex-and-pregnancy-do-you-have-to-increase-your-dose