Talk to Gynecologist on Breast Issue

aoa meri cousin (fiancee) k 1 breast jo ha normal ha but 1 chota hogya almost day by day km hota ja rha ha she discussed with me and i told her to ask her mother or unho na kaha normal ha shadi k bad Thek hojya ga now humy 1 saal hogya shadi ko but we are not concive or breast ka issue b wasay hi ha... hm na ksi sy bat ni ki kindly guide kya issue ha is sy pregnancy py frq prta ha kya