I gained a lot in my first trimester in aprevious pregnancy and then stopped gaining in my second trimester only to start back up in my third. In the end, everything worked out fine. You know if you are eating junk all day. If you aren't and still gaining, I wouldn't worry about it.
Yes ive been drinking alot of water
Typically you should only gain 2 to 3 pounds in the first trimester. Make sure to drink enough water because it might be water weight/bloat.