A question about taxes.?

If my husband and I both work. would we get more money back at the end of the year. He usually claimed me when I was not working. But now that I'm working can he still claim me? If he does that would we get more money back once tax agents enter in how much I earned. The reason I ask because someone told me that If I work my husband can't claim me on his taxes. We usually file jointly. How would this work? And if he can claim me would the tax agents add my earnings also?