What does your doctor say about this? I think it is better to consult with your doctor if you're concerned about irregular density. Masses with irregular shapes and indistinct margins have a higher likelihood of malignancy( Malignant means that the tumor is made of cancer cells). But I hope that it will not be that serious and you're doing well now.
Best wishes!
It's always scary when you hear irregular and then you also see the word equal. Confusing, right? Doctors need to do a good job of explaining results. I believe this just means that both breasts are dense but not completely symmetrical. This would probably be the case for most of us. But if it is a huge difference between one breast verses the other, that is more concerning. This is a small (ish) difference. Please let us know what your doctor said about it. https://www.medicalnewstoday.com/articles/321823