I'm in week 3 and she's starting to smel...

Hi, As its an auto they flip to flower by themselves, so in the very early stages depending on the strain you can sometimes get a mild cannabis smell, but you know its the plants getting ready to produce some pre flowers then to be nice big buds. Looking at your stats everything looks healthy and on the right track so it couldn't be anything else. If you're worried about the smell have a look into getting a carbon filter. There are also odour gels you can get to control the smell from your local hydroponics shop, or online. Hope this helps