Creepy moment

My husband and I were in the middle of doing the deed. When we hear our bedroom door open and close. We jump up thinking it's our daughter opening the door. No one is there when we look. Our daughter is 2 the knob usually shakes when she opens the door. My husband immediately creeps through the house looking in every bedroom. There was nothing so we finish. As soon as we were done the door opened and closed super fast again. So my hubby this time grabs up the 9 and walks through the house. Makes a straight line to our daughters room cause now we have a weird feeling nothing and no one in our house. We don't know what to think. It's 1 in the morning and now I'm freaked out and super alert every sound is making me jump. Sorry for the weird story but it freaked me out