I was in the same position last year with my mare. I went for putting her in foal and it was the best experience i have ever had. Your mare might be fit for work by the new year, but she might not! That extra time off might be better for her. What's another year. Life is too short for if's and and's. We all worry about things going wrong, it's natural! Just think this time next year you could have another champ in the making. Owning a horse from young and knowing it,s background is one thing, breeding your own and moulding it from day one is a whole different ball game. Go for it. It,s the most rewarding thing you will ever do! Get looking for a stallion, it's not too late.
I'm not a medium but I hope this helps. Good luck xx