my friend is jealous I'm pregnant.

my best friend seems very jealous and negative about my pregnancy. ive been trying for 3 years, and this is my first. my husband and I have been together for 6 years. every time I say something about my pregnancy she gets really nasty and negative. idk what to tell her anymore. shes been trying for 4 months now and no luck. I feel for her, I tried for 3 years!! idk it just hurts my feelings she's not supportive.