Worried about lump under armpit?

[HumDumMum]

A few days ago I noticed under my armpit was really tender. I had a feel and there's a lump about the size of a pea and 2-3 smaller lumps under it. Tender to touch and I think a bit itchy but not sure if that's my imagination.
I'm 35 weeks pregnant. I've looked online and scared myself stupid as every other armpit lump seems to be breast cancer.
Has anyone had anything similar? Photo not great but best I could get myself.

Omg Iv got the same but it’s so sore it hurts to even move my arm what can this be I fort an I growing hair or something

I've got one now, for the third time! I've concluded it's something to do with how I shave. It's not a lymph node as I can pull the bump away from my body, its just under the skin. But my god do they hurt! Kept waking me up! Hot water bottle under the arm.

I was in the woods a week ago and thought I had just gotten into some poison ! A couple days ago I feel a dime sized knot under my left arm near the poison. The knot feels like a hard blood vessel, and the area around the poison and knot or lump is very tender. The area has a small pain tender feel.