Honey missing only 3 days out of a whole month is GREAT and isn't going to affect your progress one bit. I've told my little story probably a hundred times, but I noogled for, 5 months I think it was? Gained a cup size then stopped entirely for 8 months... I remained the same cup size. A little less full from not having the constant stimulation from pumping, but my breasts were permanently larger.
I agree with Diosa -- it's more important at this stage to see if you FEEL a difference, rather than see it. It won't always show up in pics, although to my eye I see a difference in yours.
Another thing is you have to take into account where you are in your cycle -- in your luteal phase (after you ovulate and before your period), your breasts are going to naturally be fuller and will respond better to NB with increased and/or more lasting swelling.
Keep at it -- you have great breasts to work with and they are only going to get even better!! ::hugs!!::