I am ten days late on my period and I'm never late I have took 4 pregnancy tests and they have all come back negative could I still be pregnant??

I'm not surprised they came back negative at ONLY ten days late... odds are high for a false negative that soon... by the time you are a month late they become very low.

I'd wait a few weeks and try again... ONLY doing it the first thing in the morning right after you wake up with the first pee of the morning.