Anyone struggling with the thought of change?

Is anyone else a 2nd or 3rd time mom to be and struggling to be excited because you’re scared of the change to your family? I’m a 3rd time mom to be I have two girls who are pre-teen & teen from my previous marriage. It’s been me & my girls for so long and now with just recently getting married, planning to move to another state for hub’s job, and then surprise baby on the way I’m getting some real baby blues!! Feeling like nothing will ever be the same, like I will miss just being mom to my two girls, fearing I’m ruining all our lives (that one is probably super dramatic lol), and just overall nervous for so much CHANGE! But then I feel guilty because little lil in my belly is a blessing & deserves to be celebrated & anticipated!! Really struggling right now.