Emotional dilemma

Our first baby is almost 10 months old and we want to start trying for our second, for valid reasons I promise. We have some physical and emotional issues though

1. My period hasn't returned. My daughter still nurses pretty often and I feel like it's never going to come back. It upsets me that there is no foreseeable time when I'll be fertile again- could be another year who knows

2. I'm not willing to break the breastfeeding bond with my daughter to try to jump start my period. I really enjoy this time with her so much and don't want to sacrifice a single second of her childhood. I would also be incredibly upset if I lost my milk and couldn't nurse her because I got pregnant and I'm not sure how common that is

I know this is dumb but I'm in an emotional controversy. I love my daughter and am so incredibly grateful for her and want a sibling so so bad for her but I'm not willing to give up anything with her in order to make that happen. I guess just not being able to have a timeline is depressing me since everything is up in the air. Can anyone relate or offer advice?