Going off of birth control usually sends one's hormones into a bit of an uproar...and it's pretty common to get a double period, especially if you go off them in the middle of the pack. One when the pills wear off, and another when your cycle would ordinarily start if you weren't on the pill. Stress, dieting, and being around an "alpha" (pheramone/period alpha, not necessarilly personality alpha) female can also cause your period to skip, end, or double.
The earlier in your cycle you start bleeding, usually the redder it is (there being more O2 still in the blood...towards the end it goes purple/brown because of the lack of O2 and a wee bit o decomp.) Some people bleed very early one, some people bleed later on (from when the lining of the uterous starts shedding). With only 2 weeks in between periods, I would expect bright red blood, and less clotting than you would find in a 4-5 week period.
Unless you're prone to scar tissue, I wouldn't expect that the D&C would have any effect (at least I was told mine wouldn't, and I'd lost several early and one, also, at about 6 months).
All this aside, if you're concerned, hop on over to your OBGYN :)
best of luck to you!
