Painful armpit swelling

ZZ

Hi all, was wondering if anyone else has experienced a painful swelling in their armpit? For the last three months I’ve been getting it around my period, then it goes. Since finding out I was pregnant it came back (when I would have been on my period) and is still there a week and a bit later. Just wondering if anyone has also experienced this. I have mentioned it to my doctors and have a scan booked in, precautionary