I don't deserve to be a mom

My husband and I have always wanted kids and it's been my dream to be a mom. I got pregnant while on birth control, total surprise. I was so so excited at first but these past few months I've just been filled with guilt. There are so many couples that try for years to get pregnant and then there's me that got pregnant without trying and I feel like I just don't deserve to be a mom. I feel like I'm unworthy to be a mom..and I just can't shake this feeling of inadequacy. Of course I want to keep this child I would be devastated if I miscarried but I guess I'm just wondering if I'm the only one that has ever felt this way.. I feel so inadequate