Has anyone literally not gained weight, but lost without gaining anything back?

I am 17 weeks 3 days and I started with a weight of 176.6. I went up to the 180 in the beginning of my pregnancy, but have been down to 172 and maintaining since. I have not been sick and have not changed my eating habits, except I added in snacks and eat when I get hungry. My doctor didn’t seem too concerned at my last appointment (14 weeks), just questioned my eating habits. I am considered “obese” because I am 5’2”, so she just said its okay because I technically have room to lose weight. I guess now that I’m over 17 weeks and still not gaining, I’m just wondering if anyone else has not gained anything without being someone who goes to the gym religiously 😂