If you feel something in your breast that feels different than the surrounding breast tissue, then you should definitely make an appointment to have that lump evaluated by your doctor
as soon as possible. You could make an appointment with either your primary care doctor
or your OB GYN doctor for help with this.
The reason for the need for an appointment is that it turns out that it can be difficult to distinguish lumps caused by breast cancer from other less serious forms of breast lumps. Although you are generally right that breast cancer lumps tend to be harder and less mobile within the breast tissue, this is not always the case.
Your doctor can perform a very careful breast exam paying attention to the area that you have identified. Depending on what they feel in the breast tissue, they may decide that the lump should be observed for a month or two to see if it changes or goes away. On the other hand, they may decide that the lump needs to be evaluated. Evaluation of a breast lump may include a mammogram or ultrasound
of the great. Depending on what these studies show, it might be necessary to biopsy the lump.
Go see your doctor right away!