How do you do this?

We had a miscarriage in October. We started trying again in January... Yesterday morning, I got my first bfp! After so many negative tests from the months before.. I tried not to get excited, I knew I had to be cautiously happy because of my past. But this was my rainbow baby!
I started my period this morning. So, it was either a false positive or a chemical. I'm so devastated. I got my hopes up when I knew I shouldn't. My husband doesn't care at all, he just keeps saying "Maybe we should wait a little longer." Or "Maybe next month." I'm just having a really hard time with this. How do you do this for years? It's only been 3 cycles and I'm trying so hard to stay positive, but it's like my body is rejecting another pregnancy