Unsure

I lost my baby last August. The father and I broke up during that time. I am with a new guy. He is great, he already has a child, and is amazing with my 2. He is talking about wanting to have another baby with me. I'm not sure how I feel, I am not opposed to have ano ther child, but I feel like if I do it like I'm trying to replace my sweet unborn Hayden. I have a lot of mixed emotions right now. He is being great about it though. He is adamant about wanting another, but is willing too wait until I am ready. But what if I am never ready? What if I can't get over the feeling of having another I would be replacing Hayden? I am so unsure.....