Hey Bishbop,
I received hATG the second week of Jan 2014, and I remember feeling very similar to you when I saw even the slightest rise in my WBC, when I was two months post ATG I would see roughly a 0.1 rise in my WBC every 2-3 weeks. Some weeks it would drop a little but then recover back up again by the next lab.
I would take any increase as a positive sign (even if its a small one!) since you can't expect your counts to jump over night, even though that would be great
At first my WBCs climbed incredibly slow, but as of more recently (5-6 months post ATG) they have started to rise a lot faster.
To give you some insight on my experience, here's how my labs trended over the last few months:
WBC (range per month)
feb: >0.1-0.1
march: 0.2-0.4
april: 0.5-0.7
may: 0.8-1.1
june: 1.2-2.1
july: 2.2-2.9
ANC (what it was at the end of each month)
feb: 0.02
march: 0.10
april: 0.27
may: 0.59
june: 1.25
july: 1.74
RBC (units per month)
feb: 14
march: 8
april: 3
may: 2
june: 2
july: 0
Platelets (units per month)
feb: 9
march: 6
april: 5
may: 4
june: 0
july: 0
Hope this helps a little!