I'm one of those people who lost a LOT of hair. My hair was thin to begin with, so that didn't help matters.
My memory is fuzzy now, but it started around 2 1/2 or 3 months, and continued for about 2 or 3 months. It will get worse before it gets better. It started growing back in at about the 6 months mark...you'll notice little fuzzies sticking up on your head. At this point (15 months), it's about 75% recovered. I still have thin spots, mostly on the top and sides, but I've drastically changed my hairstyle to compensate. Check out the photos in my profile album, and you can see the huge change in hairstyle.
In the meantime, here's what MIGHT help:
*Up your protein intake to 100 grams per day.
*Start taking biotin (available at Walmart, etc)
*Start taking zinc (available at Walmart, etc...but it might upset your tummy, try taking it with a meal)
*Be very gentle with your hair...avoid heat styling as much as possible, avoid chemical treatments, avoid friction (use a satin pillowcase if you can find one).
*Have an honest discussion with your hair stylist. Tell her the problem, and let her know it's going to get worse over the coming months. Ask her advice in what hair style would be most becoming on you at this point. Don't be afraid of drastically changing your hair style if that's what you need to do.