Feeling a little down.. Help :(

These couple of days I have been so sad. Thinking about the future. How it will be once baby is here. I am very excited and happy I get to be a mom! But there are times where I think how will things will work with my husband and I. Will we be the same, will something change, will we love each other the same? I'm just afraid. 3 years ago I was in a 7yr relationship and he left me for another women... Now I just think if my now husband will ever stop loving me. I just need some advice from you guys 😓