Hi- little worried today after finding a lump in my breast!

Hi everyone, 

New to the site. 

I found a lump in my right breast and in comparison to my left, it feels a little more swollen?

I recall feeling this lump a few months ago and thought nothing of it and felt it there last night by accident and now I'm worried. My nipple and surrounding breast area does feel achy?

I will try and book an appointment with a GP tomorrow, however I don't hold much hope as it can be difficult to get appointments due to the demand.