Self esteem is going down

I'll be 23 weeks along on Saturday and some days I really don't feel myself at all. I've only gained 7 pounds overall so far, but yet I can't help but feel down and guilty if I eat a cookie every once in a while. I've always had body image issues ever since I was a kid, but I hoped being pregnant and bringing a new life into this world would give me a different outlook on my changing body. Anyone dealing with the same issue?