First I will say that I really woudn't worry too much. I know this is an impossible task for a new mommy, but I thought I would say it anyway.
In my experience... some babies poop really well and some don't. The main reason babes may not poop regularly is thier immature digestive system. Sinceyour babe is ebf... you REALLY have nothing to worry about. What you can do is try to ease the babes discomfort between poops and try to help get the poop out. BTW, my baby went 14 days without pooping once and regularly went 5 days between poops for the first 3 months.
First you can eliminate lots from your diet that passes through the milk and that your baby can't digest easily - gassy veggies (broccoli, cabbage, collards, brussell sprouts, cauliflower) - egg whites - peanuts - all diary - chocolate - wheat. Most moms only have to eliminate some of these foods and not all of them. For me it was diary, egg whites and peanuts.
Second you can help your baby by bicycling their legs, tummy massage and verbally reasuring them when they are straining or in a painful gas situation.
YOu can also do the finger/suppository up the behind thing, but I would only do this after many days (my personal choice)
Third you can buy gripe water to help ease digestion or give chamomille tea or mylicon drops.
I don't think it is strange to miss several days of not pooping. It really does take another 3 months for your baby to mature in their digestion... for me at almost 3 months exactly all of a sudden 2 poops a day
, then when I introduces solids we were back to every 3 days... then she went regular again... then when I intro certain foods she skips a few days again. And on and on like that.