I AM SO MAD! Help

So my Fiancé recently told me what my MIL said to him. She asked him to be honest and tell her what he thought about our baby and that she knows her kids and it seems like he didn’t want this (I’m 20w pregnant) he responded by saying that although our pregnancy may be a bit early in life (I am 20 he is 22) that he wouldn’t change it and she told him she thinks I planned this and that I’m telling everyone he is excited about it! WE planned to have our baby. HE asked me to get off of birth control. I feel so angry and betrayed. My SO defended me and told her he knew I wasn’t on birth control and that I wouldn’t do something behind his back but still i am so angry. Anyone else have this problem?