24 / Inflammatory Breast Cancer? Left breast tissue feels different, thicker and painful, no lump

Hi I am hoping i can get some reassurance or guidance. 

2 weeks ago I began to feel sharp and stabbing pain intermittently within my left breast. Even slight knocks from my partner hugging me or from my own arm just repositioning myself, i would feel a pain that made me shout ouch!

I am very small chested A cup, i have never accidentally knocked my breast with my arm. This is when i have a feel and realise there is MORE there, my left breast has gotten bigger. More tissue, feels thicker, some hard bits/firm bits/soft bits. 

There is more thicker tissue travelling up towards my armpit, or so it feels. 

I want to note i have never had breast pain/aching/issues/lumps/cysts. 

I have been to GP (02/02/26) she was great and said to come back on two weeks on (16/02/26). But tonight i am experiencing more breast pain, had a feel and there are more little hard bits in my breast. at first it felt like one little stone, now it feels like there are many. Going closer towards my armpit. 

Should i go back sooner than the two weeks? I’m scared of Inflammatory breast cancer.