Good or bad reason to possibly want to start trying?

I just found out my mommy has been diagnosed with stage two breast cancer.. I have always wanted to give her grandchildren, she will be such an amazing grandma. She will fight through this and she is strong and stubborn.. but facing this I am scared to risk letting the chance to give her that and have her there during that expirence slip by. I want to give her some good news and something to look forward to and fight for during this hard time. I have had baby fever the past two years and would love to be a mom in general. Here is my issue though, my boyfriend of ten years doesn't feel like he is ready for a baby yet. We aren't financially amazing, but we get by. I stay at home and perform, and he works full time. I don't even know how to approach this. Any advice or guidance would be appreciated.