Too much weight at 15 weeks?

I'm 5'2 and I was 126 pre-pregnancy. Now I'm 15 weeks and 136lbs. I think lbs wise I've gained too many? I'm a teacher and haven't been working since beginning of June and today I had a meeting and put on my normal dress pants and dress shirt. Although I don't have a largely noticeable baby belly I feel pretty solid and I'm aware of my stomach at all times. I guess what I'm trying to say is I already feel heavy. Is this normal or have I gained too much too soon? Please honest opinions. This is our first.