Attitude changes

I have been ttc for three years. My husband and I had a miscarriage in August and we we're devastated. I swear ever since then everyone and their momma ( literally) are getting pregnant. Normally, I am over the moon excited for everyone but after the miscarriage I feel so bitter. My best friend is pregnant and every time she shares news of her baby kicking or sonogram photos I can't help but to feel jealousy and then I feel guilty for being a bad friend and not responding with joy for her. How do I get over this bitterness? I'm so tired of being miserable.