Hiya

This is pretty normal for them to say this. I found a lump in my armpit and left it a good 4 weeks before going back and then was referred to the breast clinic who checked it out and was told it was nothing to worry about. 

They say this just incase you could have a viral infection or a cold ect and it could just be lymph nodes swelling due to this. 

But obviously it is up to you as its your body, i hope it turns out to be nothing. Xx