Congrats on your pregnancy!
My Dr has been rather uncaring about me feeding DD whilst pregnant. I told him at my first appointment and he just muttered, "That is not a problem" and it hasn't been mentioned since
DD has been feeding consistently throughout this pregnancy - I had sore nipples for 14 weeks and initial attachment is still painful but after a few seconds the pain goes away. I had thought that DD might self wean as my milk changed to colostrum but she loves that even more and has upped her feeds to about 5 -6 per day/night and asks for 'yummy milk please!"
My mum and a couple of friends have been very unsupportive of me breastfeeding during pregnancy and informed me that my baby is missing out and will be small, that I will tire myself out etc but I just smile and ignore these comments now.
Best of luck with your pregnancy and feeding your LO throughout - don't worry about what others think just do what is best for your baby and you!