I don't think I love my baby

My baby boy is 4 weeks old. Everything has been fine the past few weeks. He's breast fed, putting on weight etc seems content other than his bit of colic but I just don't think I'm feeling it. It's sounds so stupid because I have been trying for this little one for 4 long years with multiple miscarriages and fertility treatments but I just don't feel that overwhelming love all these mothers seem to have. I feel like I do all the things I do for him because I have to and it's what is expected of me... I just don't know why I'm feeling like this 😥