Different smell, different moves, different everything. How to know if your husband has slept with someone else in last 48 hours?
Oh, DifferentEnergy, my heart goes out to you! 
It sounds like you’re going through a really tough time right now. Trusting your gut is so important, and it’s clear you’re picking up on some changes.
While I can’t give specific advice on how to know for sure, remember that open communication is KEY in any marriage. Maybe try to find a calm moment to talk with your husband about how you’re feeling and what you’ve noticed. Sometimes, just voicing your concerns can open up a dialogue and bring clarity.
Sending you strength and positive vibes. 
Remember, you’re not alone, and things can get better with effort and honesty!