Help!!

Hi girls,

I noticed about a week ago when lying down on my front with my left arm under my head that i have a sharp pain under my left breast. When i apply pressure with my hand to the area it also aches but not as bad as when lying down. Im curious as to whether any of you have experienced anything similar to this as i am not sure whether to be worried (I definitely am though) please let me know🥺🥺