Is it okay for me to be upset

I got had a miscarriage a few weeks ago, I didn't want the baby because I am not ready mentally or financially to support a child properly. But after I had the miscarriage I didn't feel happy or any type of relief, I feel sad like some part of me is missing. Is it okay for me to be upset since I didn't want the baby to begin? I feel like it's my fault because I thought so negatively about it before. It's been months now and I still feel really upset, is there anything to make me feel better? 

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