It is so great that you are a working mom with a supportive dad at home, but it sounds like you may need to have a discussion with your pediatrician to feel out if they are supportive and knowledgable regarding breastfeeding. To me, that is extremely important. Keep up the great work and make sure that you are able to spend lots of snuggle time with the baby when you get home from work and on the weekends. That lends itself to frequent breastfeeding and will increase your supply also.
Good luck and I hope you will keep in mind that you are doing a fabulous thing for that baby and don't give up!! Every ounce is liquid gold!!