Yes, but the pink swayers throw away the first batch and only use the second! If you DTD two times in succession, that will simply add more sperm into the vagina which would be GOOD for blue. Also the high pH of the semen may help max. numbers of sperm from the second batch to survive
That having been said, timing does NOT sway and so you need not worry at all about getting in the "girl zone". The "girl zone" does not exist. Not only that, but even if you ended up with an O+12 you have very slim chance of pg anyway. The odds would be that you would conceive with the earlier round of BD anyway.
Waiting 12-24 hours would certainly allow sperm numbers to have time to rise, but as long as you're using both batches, BD 2 times in one day is ok for blue!
