Reccuring fever in 5 year old boy.

My concern is that in last 2 months my child get fever 3-4 times actually I am explaining in detail here first he got fever in first week of March which subside by medicine zifi 100 and paracetamol the fever subside in 5 days then again in 1 April he got fever which again subside by medicine above in 3-4 days and after that yesterday also he had fever at morning but after giving para cetamol now he is completely fine he is very active playing watching TV and all not crying everything is normal but I concern about that fever which repeat in last 2 months I looked at net that it is a symptom of blood cancer so sir please advise  everything in detail the child is completely active the fever first happened in march completely down after paracetamol again in April fever  there for 3-4 days but fine after zifi 100 and paracetamol but yesterday also he having fever but after giving medicine he is fine and one sister com to play with him have common cold from 4 days but my doubt blood cancer