Hi arpita, mild bleeding from the gums once in a while during brushing is quite acceptable and could be because of over zealous or vigourous brushing which hurts the gum. If bleeding from gums occurs unprovoked or without any injury or if there is unexplained bruising or prolonged bleeding from any cut site then you need to look into it and get a routine hemogram along with BT and CT done. I dont think CT scan is required at this stage. You may opt for a general health checkup as well which will guide you to further course of action if anything is wrong. Relax everything may just be normal;