No sex

So usually me and my SO would have sex everyday almost. Im a little concerned as its been 5 days going on 6.... im worried because we never go this long without sex. I makes me wonder whats changed. It cant be realted to stress because things are actually going right for him at the moment. Ive tried to seduce him but hes just not interested... also my period is due so im probably gonna have to wait another 8 days