Rapid Weight Gain, Aches, and Floaters

First time mom... Trying to decide if I'm overreacting or something could be wrong. I am 15 1/2 weeks. Have following going on...
-noticed eye floaters for about the past 5-7 days
-stomach has ached around my belly button today (not an upset stomach feeling, an ache)
-gained 6 pounds in less than two days (water weight?) 
Normal side effects? 
Thank you for your help!!