I'm off to the breast clinic in just under 2 weeks for unexplained breast pain. It is more 'armpit' Pain that has been coming and going for the past 6 months (I know, a long time, but I first felt it at Christmas then modified behaviour i.e. Not picking up toddler on my left hip, seemed to sort it out and it went away for several months). Now back again and I began worrying because the pain radiates into the breast.
Neither me nor doctor can feel any lumps, but like another poster said, it doesn't mean there is nothing there. My doctor said he'd rather rule out anything breast related as a matter of precaution.
I am 36 with 3 kids. I carry my youngest on my left hip. A lot. Pain is that side. I swing between worrying like mad, then feeling quite calm. I've no idea what they might find - doctor told me that the mirena coil (which I had fitted during first bout of pain) can cause breast cysts, so it might be that. Or hopefully just muscular pain caused by carrying child on left hip.
Most websites do say that pain is a very rare first symptom of breast cancer (even our hospital breast care dept leaflet says this), however I am the type of person who convinces myself that I'm the rare person!
I did see my gp about 3 years ago with similar breast pain - same side as now (left), and he was very reassuring and said it may well be that I was holding my baby to feed her that side and it was muscular. Pain went within a few weeks of this reassurance.
Anyhow, long post so sorry, but just to reassure it may well be the fact you have 2 young kids and carry them around a lot, and your doctors reassurance will be enough for the pain to go away. But I'd say if pain not gone after another full menstrual cycle, then go back and ask for breast clinic appointment, just to be super cautious and put your mind at check.