emotional waiting...

I have my first scan in 4 days and I'm really exited. I'm a little worried incase something isn't right. I feel really bad that I'm still smoking I'm trying my best to stop and I've cut down a lot. Im really looking forward to seeing my baby on the screen I listen to the heartbeat every day, but the last two days I couldn't find it but then it popped up really strong, so they're playing hide and seek I think, I just don't want to get emotional when I see it, my mom and boyfriend will be there and I always act like a tough cookie but I don't want to cry in there. Did any of you cry?