Pregnancy sex

I am not currently pregnant, we are TTC#1. I've heard some horror stories about pregnancy sex. I'm am so scared my husband is going to think differently about my body after I get pregnant. I don't think he knows how many changes our bodies, as women, go through. I am eating healthy daily and exercising multiple times a week. Any other advise?? My mom gained a lot of weight when she was pregnant and was hard to lose, I don't want to go through that.