I am 13 years old girl and I started my period 5 months ago and I have noticed some breast lumps in both breasts and there is a lump in my right breast and it feels like glandular tissue when I feel it standing and flexing my chest and It feels soft and moveable and it feels small but when I lay down it feels a little bigger and it feels soft and moveable but when I put my hand up and flex my chest then only it feels hard and it feels like not too moveable and last month it was hard and firm but this month it has gotten very smaller and soft and it pains a little when I am on my period and gets slightly bigger during periods ,is this okay?