Not happy for pregnant announcements from others...

Megan
My husband and I have been TTC for 8 months now.. I feel like everyone around me is getting pregnant right off the bat or without even trying. My best friend and her husband tried for one month and sure enough they're pregnant. When she told me the news I had a really hard time being happy for her. I seriously almost broke down and cried! Actually I did once I left her house. I just don't see how it's fair that it takes some people forever to get pregnant and others can have sex three times and BAM! Baby! 
I feel horrible for my reaction (or lack there of) but I'm honestly not happy. I don't want to feel this way but I can't help it. 
Can anyone else relate or give advise?!