Strange lump

Hi, I have a history of cysts and benign changes in my breasts. Family history of bc.

I'm used to being told everything is a cyst but I found something different today. I usually do breast exams with two fingers but today I decided to poke around more so to speak. I felt a bumpy large mass of what I wanted to believe was two or three cysts attached to each other. Or else it's a textured irregular lump which I know is bad. It stunned me and my heart has been sinking ever since. I want to think it's a cluster of cysts but that seems unlikely. It's misshapen. It seems to move around under my fingertips slightly but I have larger breasts and can't tell if it's just breast tissue moving around. I just started my period or else I'd try to assess if it hurts. I do get painful armpits and breasts right before my period but I don't remember if I felt pain in this area.

I'm dreading the long wait to get seen and imaged so I just wanted to know if any benign change can be like this. Can something benign have an odd shape? Does that ever happen? Thank you so much. Just trying to get through the waiting.....my guard has been way down since covid and I feel so guilty for not paying close attention.