My partner really doesn't understand pregnancy hormones :( I have tried explaining it to him and he…

My partner really doesn't understand pregnancy hormones :( I have tried explaining it to him and he just says "every other pregnant woman I know isn't like it 24/7" and if he is in a mood and I ask him to stop he just says "now you know how I feel all the time" :( it's really getting me down and I feel so isolated! I'm afraid to tell him if something is upsetting me or whatever because he just snaps :/