Overweight, 16 weeks, no weight gain

Just wondering if it's okay that I haven't gained any weight yet in my pregnacy. I was already 15 lbs overweight when I got pregnant and I'm still the same exact weight. I couldn't find anything besides a dumb online chart that says I'm not gaining enough yet my average weight gain for my whole pregnancy should only be 20lbs. So YES or NO is it okay that I haven't gained any weight? My doctors appointment isn't for another week but I'm still nervous about the whole situation.