Lump under nipple

Hi,

About a week ago I was having pain in my left breast that wouldn't go away for about 2 days then on Thursday I found a lump under my nipple the size of a small marble, it feels quite deep down not visible, it's a hard lump with no pain at all

I went to the doctors on Friday and have a 2WW the doctor was absolutely lovely and said he thinks it's a duct but is sending me for a 2 week referral because he knows I wouldn't want to wait any longer, I can't help but feel like he was saying this to try and not panic me as I never mentioned anything about waiting and I'd only just found this

im hoping to get my referral in the next few days so I atleast know a date, i'm 33 with 2 children and im feeling really scared

has anyone else had a lump here and how was the outcome