Pregnancy Jealousy?!

My SOs brother and his gf are expecting. I am sincerely happy for them except (isn't there always an except) she stopped taking her bc and didn't tell him, she always talked about how gross being pregnant is, how she never wanted kids, etc. Now she refers to it as her alien, the thing, tells people they can have it and just said "they can cut the thing out of her." This makes me so furious as we've been trying and no dice! Also, she smokes pot says it's not harmful, but what if it is? She don't work, he just lost his job and they live with his mother. She complains constantly about being in pain even though she's only around 12 weeks. Drives me crazy. Sorry to rant, just had to vent to someone!