The minimum length of a round is 26 days, so 7 days won't work. And you'd have to load for at least 2 days, gaining weight in the process most likely. Also, many of us don't lose any size in P2 the first time...we lose inches in P3, so 7 days won't help you.
Hcg will help you lose abnormal fat, which includes cellulite. But it doesn't specifically target cellulite. I still have mine, although it is less unsightly than it was. I don't know where to get hcg in Mexico.
P&I says to stop hcg during your period. Most people no longer do that. I usually stopped for a day, but if you're using hhcg, you don't stop at all.