Yes, of course you should go get it checked. Even though breast cancer doesn't run in your family cancer runs in your family. Do you get yearly mamograms. Make sure they also do an ultrasound. I would also recommend an MRI if you can get your insurance to do it. Breast cancer does run in my family. I am a two time survivor. Hopefully it is nothing. But run don't walk to the phone please. My daughter also gets lumps. She has Kaiser. Her doctor wants her to get two MRI's a year because of our family history but she could not afford it. The lumps turned out to be nothing. But another one just showed up. She is getting better insurance in about a month a will be able to get the MRI. My doctor said in younger people she is 28 the MRI is the only thing the will show cancer. Please write to me if you need to talk clc303@aol.com. She has two young kids 6 and a 3 year old Autistic son. It could be because you were breast feeding. Sometimes it is because you have starting having a period again. But please go get checked. I see you stopped breast feeding. At first mine were just cysts so if it is just that it is important to keep an eye on that also. Check into if any cousins have had cancer also. I don't want to scare you but please get checked. I have also had Thyroid Cancer twice. Ovarian Cancer runs in my family also. 

Take care,

Cindy