It's hard for me to know b/c at 2 weeks pp DD wasn't sucking correctly and I was pumping with the suction too high, so my nipples and boobs were a wreck. I have heard women say that the first couple of weeks there is soreness, but it will dissipate. You know your body best - if you think something is off, go see a LC.
mine felt achy ALL the time! i would get specific spots that would feel more achy than others, but not mastisis. it never went away for me and i stoped BF'ing at 8 weeks.
Re: BF question: breasts feel generally achy...?
I had that same general achiness for the first few weeks - also they ache after he has nursed for a long time and they are "empty".
I alternated ice and heat and took Motrin. It will get better after a few weeks.