Blood count and Chemo

Hi everyone, new here 

My son has recently been diagnosed with Near Haploid Acute Lymphoblastic Leukamia there are very few cases as it is a genetic mutaition of the Leukamia cell. 

We have been told its hard to treat and he was going for a bone marrow transplant this month (September) however this has been cancelled as he was doing better than expected.

 Were told before every batch of Chemo he had they would do a full blood count. They have said this week that he does not need a full blood count for the next 3 weeks as his counts are good.  We are worried as he is tired and suffering some of the earleir symtpons as pre diagnosis and he has grown his hair back. We were told that as the chemo was killing all the fast growing cells he would not regrow hair? He is having agressive Chemo and not on a set protocol. 

Please can anyone help answer the question if having good bloods and not being neutropnic and regrowing hair is good or does it possiblly mean that the chemo is not working as well as it should ?