CHEATED on me and I don't feel anything

So we have been dating since Jun 25th and then quickly found out that I was pregrnant August 1 what a rush . this wasn't my plans to get pregnant I'm still in school, 23 years young having fun with friends and visiting places living my life. He already has kids might I ask and one baby mama who can't let go or shall I say they can't let go of each other because I just recently found out that he cheated on me with her after we broke up after a very Nasty heated argument . Now any other day I would leave and never speak to him again but since I'm pregnant I feel helpless I'm so numb and it's so crazy because I'm not weak AT ALL. I don't know what I feel. I just keep thinking about it and thinking about it. I'm 9 weeks and I kinda feel I shouldn't be stressing at all but I can't help it. It's like I fell into a depression I'm just hear on earth with no one to talk to .