How are your clothes fitting? With your workout schedule, you're probably gaining muscle, too. I'm 5'6" and hover around 169 right now, and I average about 100 miles a week on the bike, as well as hiking and other sports. I'm pretty fit and strong, but my "ideal" weight is 155. Since I've been riding so much and racing (triathlons) I try not to worry too much about weight loss and focus more on training - I don't drop below 1500 calories a day so I can stay fueled and don't bonk.
If your focus is to lose weight, you have to burn more calories than you eat, and what you eat becomes a lot more important because you need to stay fueled in order to work out. When I'm trying to lose weight (like I'll be focusing on now that I've done my last tri for the season) I'll use a program like livestrong.com to track what I eat and what I burn. i'll cut about 200 calories a day from my diet, and increase my cardio to burn more calories, but watch my intensity. I'll cross train more to keep my body interested in what I'm doing, and this winter I plan on working more on my running.
Good luck! Triathlon is a blast!