This is something you should make an appt with your OB/GYN to check out. I had one once and they sent me for an ultrasound ASAP. They don’t mess around with that stuff.
I have as well but I would suggest making an appointment with your GYN and getting a breast exam done. Do you do self checks regularly?
I would definitely make an appointment with my doctor just to be on the safe side. Better safe than sorry