Advice? !

Lately my husband has been telling me he doesn't feel special, or even think the fact I got pregnant with his child is special (we weren't exactly trying but we're excited from day 1). He says it's because he knows in my past relationships it could have happened too so what makes him so special. Anyone else deal with something like this? It's making me sad because that's my past, and I'm so over the moon to be carrying his baby I just wish he felt it were special like I did. I feel like I've somehow done something wrong because of my past ? Any advice on how to get him to feel better about everything? I tell him I love him constantly and how happy I am that I'm carrying his child and that he's gonna be a daddy. But these past few days he won't even really kiss me and when I say I love you its minimal response if at all..