Palpable lymph nodes in both armpits what does this mean?

[Biancel]

Hi I have palpable lymph nodes in both my armpits . There's like 5 on my left armpit and three on my right armpit . They're also painless and don't seem to be increasing in size . I've had them for a while , I can't exactly say for how long but definitely more than 3 months ,not sure if I've had them for longer than that . I also barely started experinecing under arm pain mostly on my left armpit. And my breast are extremely painful . I can't lay on my stomach because they hurt so bad my kids can't lay on my chest because they hurt ! In the mornings when I wake up they hurt the most I can barely even touch them ! I'm also three months pregnant but I had this pain since before I was pregnant like. 1 or two months before . They're also extremely lumpy. please  help Im scared that I might have breast cancer ! I'm also 21 years old.