Have you gotten caught

Have you ever gotten caught by your child doing the "YOU KNOW WHAT" ? Well lets just say a year and a half of trying for second baby and im anxious to hit the ovulating moment just right well not so right son was taken a nap and he snuck upstairs and caught a moment of for literally 2 minutes . We had clothes on well besides my pants . Im soooo embarrassed hes only 4 years old I dont even know what to say to him hes asking his dad why was he doing that to me. Have any of you ladies ever got caught ?