The right side of my thyroid is enlarged. What does this usually mean? And what can be done about it?

I'm a 35-year-old female. Three years ago, the doctor noticed a bulge on the right side of my thyroid. He ran bloodwork and I guess everything was normal because I never heard anything further. This year at my physical, I brought up the possibility of hypothyroidism because I have had some symptoms over the last several years (weight gain, fatigue, depression, cold intolerance, visual sensitivity to light, etc.) and also because both my mom and her mother suffer from hypothyroidism. The doctor felt the lump on my neck, which I mentioned because it seems bigger than it was 3 years ago, and he sent me for bloodwork and a thyroid ultrasound. I was told the bloodwork results were normal and I had the ultrasound a couple of days ago. I'm just wondering whether it's likely that they will do something about the bulge in my neck. It's not quite visible to others (at least not that I have been told), but it can be felt very easily and I don't want some big goiter sticking out of my neck.