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Help!! Up until now my nipples always touched the top of the cups, now they aren't. Is there something wrong with my pump?

I agree with Sweetorange, you don't want your nipples to touch the top of the cups. If it does, it could be a sign that you either need a bigger dome size or that you're pumping way too hard. 

The reason why it might have touche it initially and isn't touching it now could be that your breasts are rounding out and becoming denser (which is a good sign of tissue developement). 

If your pump wasn't working, trust me you would know.