Same weight but different body

Hi! I’m currently almost 18 weeks. I’ve gained about a lb and a half so far. I’m about 110lbs. My weight is basically the same but my legs look so different. I’ve always worked out and had toned legs. They weren’t muscular but didn’t have much fat. I still work out and eat pretty healthy but as I looked in the mirror my legs look huge and I’ve lost so much muscle in my thighs. Is anyone in the same situation? It’s making me self conscious now. I thought if I continue to work out my

Body or legs at least would be somewhat lean. This is my second pregnancy and with my first I was super unhealthy and gained 60lbs. I don’t know if I should walk more but I am terrified of getting as swollen as I did with my first.