What spider has a brown and white / brown diamond pattern on the back of the abdomen is big?

There are spiders that lurk in my room that are small enough, I estimated the length of leg roughly that of a penny. The abdomen is very big on them, about 1 / 3-1 / 2 the size of a pea. On the back of the abdomen is a pattern of brown and white board marker. What is this spider species and it poses no danger to anyone though?

do u live in a cupboard under the stairs, Harry Potters ...

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