Turning bitter

This year has not been my best. My husband and I have been trying almost a year now. I had a chemical pregnancy in april and a miscarriage (6 weeks) last month. Now, I feel bitter and resentful towards two coworkers who just told us they're each about 8 weeks along. 1 was trying and the other was "accidental" (said she was going to trap her man either by marriage or a baby) They keep making comments that aren't meant to upset but it does-like if you're not gonna use these onesies, can I have them? I'm trying my best to look at the positives of the year-we bought a house, we adopted a puppy, we went on an amazing vacation. Some days it's easier but I feel so bitter about it and I'm not like this usually. Anyone else go through it/feel this way?