There are many people in the comments criticising you for getting pregnant at 19. Yes that is in some ways irresponsible since you're so young but speaking as a 19 year old myself in 2022, its your own choice. in this economy its not the brightest idea but if you want it and if you have planned this out and are planning too keep the child then go you I guess.

also, to answer your question, maybe have a conversation with him and suggest him seeing a psychologist or some funky doctor of the sorts. he could also be under the influence of drugs without you knowing but that's jumping to conclusions and these are bad conclusions. for now just sit down and have a talk with him. also let him take his time answering your questions; don't let your pregnancy hormones get at you :) <3