I don't press very hard, so why are my gums bleeding when I brush my teeth?
It can be gingivitis...you should consult your dentist. I don't know if it is though because I was listening in at the dentist office and sometimes your gums bleed because they haven't been brushed in a while, even one day will set them off. It's happened to me before. They will stop bleeding when you start brushing twice a day everyday for about a week.
Well sometimes it isn't gingivitis it is because you don't floss or brush your teeth often so that is one possible thing.
Mine do that too. it bleeds because you have gum disease gingivitis. I ues Listerine for that problem.
Gingivitis is probably what you have
go to the dentist :D
and change your brush