i understand how you feel as I felt exactly the same and it is totally normal.
I had a surgical abortion four weeks ago (I was 13 weeks pregnant) and just prayed that I would miscarry so the decision would be taken out of my hands. The procedure itself was fine and pain free (I had conscious sedation) and I felt such relief after but did feel so upset for days later and still have the odd 'what if' teary moment. I think a lot of those emotions were guilt and hormones settling. I know though that my decision was totally the right one for my family and my situation. Be kind to yourself hun and good luck for tomorrow xx