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Could Reese Witherspoon be expecting her first child with agent hubby Jim Toth?

We spotted Witherspoon, 35, looking very happy as she left a medical building in LA on Monday.

The same building holds the office for a gynecologist who is often visited by pregnant celebs.

Witherspoon and Toth, 40, married at the end of March after being engaged since December. They first started dating in January 2010. Reese has children Ava, 11, and Deacon, 7, with ex-hubby Ryan Philippe.

The actress has made it clear that she wants more children ... see what she said about the idea after the jump!