How to deal with body image during pregnancy?

I Am a FTM. I am only 13w4d and I'm already struggling with the changing appearance of my body. I can't imagine how I'm going to feel the further along I am. I've never been super comfortable with my body but in the last year dropped 20 pounds and finally felt ok with my body. I know I have a miracle growing in me but I can't stand the thought of gaining 15-25 pounds. And the thought of getting stretch marks😱😡also, thinking about the horrific things a vaginal delivery can do to down there! 
I'm extremely nervous that my husband won't find me attractive after all of this! 
Any advice on how to deal with feeling like this? 

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