Hi Melly! You don't always have to see water leaks to have mold but it's got to be somewhere behind the walls. A mold testing company would be your best bet. Do you smell the mold say like in the bathroom or laundry room? Have you lost your taste and smelling abilities? New houses have just as much chances of getting mold. Has it affected you sinuses? I have a mold exposure story that i'm writing up for Youtube to help with letting people know how serious this can be. I was exposed in 2011 from living in a old home with mold. Long story short, ive had 3 sinus/moid/fungal surgerys in the last 2 1/2 years. They had to remove quite a bit of damaged bone in the middle of my head/skull. Aspergillus is highly corrosive and destroys tissue and bone. Of course there's more to tell of my story but for now please have your house checked. I wish you well!