Pain in armpit after fibroadenoma removal

Hi, 

I had a lump removed in January that turned out to be a fibroadenoma, the lump was causing some pain and was also quite large. Since having the lump removed I haven't really experienced pain in that area but I am feeling pain in the armpit on that side which is a similar sensation to the pain I had around the lump. Is this something I should be worried about? All of my tests were clear so I am not too anxious but I didn't want to bother the GP if it's normal :)

Thanks.