Why does my kitchen smell musty ?

just today i noticed in our kitchen it smells musty or dirty or something.. im not sure exactly where the smell is coming from.. im thinking maybe under the sink in the couboards.. it has been really damp and rainy the last few days so im thinking maybe its just damp under the sink and making it smell alittle musty but i dont know for sure.. is there anything i can spray in the kitchen ? could it be mould ? i am pregnant so i hope not. could it just be from the weather ? thanks !