I've been breastfeeding my daughter for 7 weeks and I have noticed a painless lump in my left breast. It came on when she was about 3 weeks old but eventually went (when I checked my breasts as you would for cancer) last Wednesday i got mastitis and was put on a course of antibiotics. I feel much better now but I can notice the lump again. It's big, about the size of an avocado. It doesn't hurt unless I press it a lot and doesn't seem to move about. It feels king of round and flat though. I am terrified it could be cancer as my mum had breast cancer several times when I was growing up and eventually died of it. I'm 31.went to the doctors and she just dismissed me with another course of antibiotics which I haven't taken because I don't think i have an infection. Made another appointment for next Tuesday where I will beg for an ultra sound. Any one have any positive experiences or advice about this?