Pregnant vs not pregnant rant

Does anyone else get frustrated when thinking about pregnancy and how women who could care less get pregnant like nothing and women who try and try cant?? It drives me nuts thinking about it and how unfair it seems. I know a woman who didn't even want kids and is on her third with a different man and is bitter about it, but my husband and I have been TTC for six months with no positive result and we're both healthy people. My sister is 5 months pregnant unexpectedly with her EX fiance and they can't get along for crap and there are days I'm so jealous. It makes me so mad and bitter even sometimes reading posts on here makes me angry when women are complaining about possibly being pregnant when they don't want to be and there are so many women who would kill to be. Ughhh!!