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Weight gain!? Im worried

I have gained 20 pounds so far in pregnancy. I'm concerned because I haven't gained any weight in almost 4 weeks. The last time I was weighed at the doctor I was down a pound and I was weighing 128. I was 23 weeks 3 days I'm now 26 weeks 6 days and I'm weighing 129.5 I weigh myself at home. Should I be worried?? I have a doctors appointment this week I plan to ask my OB. I feel baby move regularly everyday, and I eat 3 meals a day and sometimes snacks in between. So it's not because I'm not eating. I'm not sure what to think