Supervisor from hell

My supervisor confided in me about her recently having a miscarriage. Ive been checking in on her from time to time because ive had four losses myself , two just this year. But im also currently 15 weeks pregnant and she has been so nasty to me at times. I try to be understanding bit at times shes just making my job harder for no reason at all. I want to be compassionate but im getting annoyed.