I would worry just a touch about a baby that young not pooping more often. It's normal for breastfed babies to poop less, but usually they're older when that happens. My first son was on a 7-day poop schedule from about 4 months old until we started solids (pooped once every 7 days) which was nice, but as a newborn he pooped constantly!!
Frequent wet diapers is a good sign. What color is the poop when you see it? It should be mustardy and seedy looking, if it's green at all, then there may be a foremilk/hindmilk imbalance. Does it smell at all? Breastmilk poop usually doesn't have a foul odor, but again if there's an imbalance, you may smell it.
Have you had a weight check yet? By 10 days old, baby should be back to birth weight or awfully close (most drs will give you a full 2 weeks to get back) and should be gaining close to an ounce a day. If you're worried, you could call your dr and ask if you can bring baby in just for a weight check, not an appt. Or call the LC where you delivered, or try calling your La Leche League, they may even have an infant scale.