Fertility treatment while working

Hi Ladies, my husband and I have been TTC for 18 months now and we think it's time to start thinking about fertility treatment. 
I'm 33 in September so don't want to wait a moment longer. How have you ladies balanced the treatment with work? I'm not comfortable discussing this with my boss so am thinking some time out to focus on making a baby stress free could be the best option. Would love to know your experiences!