Pull your plug and see what your lower unit oil looks like. If you got water mixed with it then take it to the shop. My buddy pulled his plug just for yearly maintenance and got nothing but water. It was crazy because we had just got off the lake.
Take a flashlight and look up the exhaust past the prop seal and see if it is oily because the motor will sometimes drain oil and gas mixture down the exhaust after the motor has been tilted up. If not its the prop seal. The seal under the water pump needs to be tested too.