What do I do?

Me and my SO have been ttc for 11 months now, this month we decided to use Preseed. Well, we just baby danced and I'm sitting here with my legs propped up (I know it doesn't do anything, I just do it to make sure haha) with his little swimmers in me and I get this huge wave of Anxiety over me. I'm scared to get pregnant. I'm scared to be a mom. I'm scared I will fail and I don't know if I'm ready or not. The past 11 months all I could think about was how badly I wanted a child to love and <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">nurture</a> and raise and be kind and teach and take care of. And how wonderful of a daddy my SO will be, and how happy my family will be to know that we are expecting. Everything was perfect for the past 11 months, but right now I'm scared. Why did this happen and what do I do?