When your wisdom teeth are growing in is it normal to have painful brushing with bloody taste in mouth throbbing n sore gums all after brushing?

Possibly: If the pain is in the area where your wisdom teeth are erupting, then it is probably due to the inflammation.

Yes: Yes, this is normal is the pain and bleeding is occurring in the areas where the wisdom teeth are "cutting through" the gums. Is this pain and bleeding is happening in other areas of your mouth, you have gingivitis or periodontitis. Please see the dentist for an exam.

Should be evaluated: When teeth erupt (wisdom or otherwise) through the gums, it's normal to have some soreness, discomfort and bleeding. You should see your dentist asap to confirm that there is no other problems and whether or not there is enough room for your wisdom teeth to come in or whether they should be removed. You don't want to have an emergency one day when your face is swollen or you are in severe pain.

Dentist/oral surgeon: You may have some infection that has started to form, or it may be the tooth erupting...But i would see your dentist asap to take an x-ray and determine whether the alignment of the erupting tooth is worth saving or not. I would also check the other wisdom teeth to determine their viability.

Pain on eruption (think of an infant's response to teething) is not uncommon, but pain/bleeding is not considered normal. 15, however, is on the very early side for wisdom tooth eruption. May be delayed eruption of 12 year molars, tooth or gum infection, soft tissue lesion, or so many other possibilities. Call your Dentist for examination to determine cause of your distress and appropriate Rx.