Now a BMI of 18.7; still healthy?

Here's the deal.  We went on vacation in May and I stopped breastfeeding my son.  Within days, I could see 6 pack abs and thought..."woah"....

So when we got home, I weighed myself, and at 5'8", I'm now 123 lbs.  I lost some body fat I guess due to breastfeeding.  I am also less hungry and naturally full at about 1900 - 2000 calories, despite my intense workouts 4 times a week.

Everything appears to be normal and I feel great.  Should I be worried about the sudden weight loss? 

Have to admit...it looks really F-ing good!!!  I am so cut right now!  Never had a 6 pack.  My body fat must be at around 17% or so.

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