Weight gain during pregnancy

I'm super worried about gaining too much weight during pregnancy. Currently I'm 5 weeks and 5 days pregnant and have already gained 4 pounds! My usual weight is 135 and I'm 5'5" which falls within the normal/healthy range. I don't want to gain anymore than 25 lbs but I don't feel like I'm off to a great start. I eat really healthy (I'm a dietitian) and workout 4-5 days a week (weights, cycling, yoga). I haven't been eating any different, if anything, im being more health conscious. I don't look much different either but definitely bloated. Am I just being paranoid? Did anyone else gain weight this quickly? Should I be concerned?