Ladies please tell me things will get better

I found out I'm 12 weeks pregnant, I'm 35 and have been crying every day because I never wanted children, I still dont. I'm married for 12 years now and we never wanted them. I've been on birth control to prevent it. I can't stop crying about it because I just feel like I wont be a great mom and just about how much our lives will change. Abortion is not an option here. I just need some sound advice beacsue I have no girlfriends to go to. Has anyone ever experienced this feeling only to realize their child was a blessing? Please no rude comments I'm already feeling super low.

Also just to add, we are financially stable and love each other, we just didnt plan for this to happen at all.