Lose weight in second trimester ?

Anyone not gain or possibly lost weight in the second trimester randomly? Im 26, almost 27 weeks. And a couple of weeks ago it seemed like I had put some some more weight quickly and was around 15lbs more than my pre-pregnancy weight (and then stopped weighing myself because it stressed me out that I was gaining lol). Today, I weighed myself and it's more like 10lbs more than pre pregnancy weight(so it appears I lost weight unless my scale is wrong). I havent seen my doctor in awhile but see them tomorrow and will ask. It also feels like I haven't gotten any bigger in the last couple of weeks either. It does seem like my son has, because I feel him a lot more clearly now. But it makes me worried he's not has big as he should be right now. Anyone else?

I did lower my sweets intake but I don't think that would make me loose weight really this far into pregnancy.