Cravings ?!

When did you start having cravings in your pregnancy , I am 5 weeks and 2 days and I can't stop eating food that I hate for example fried chicken. Couldn't stand it before but I have the urge to eat it now , then it makes me nauseous lol.. My fiancé thinks I'm using this as an excuse just to eat things that I like, like cheesecake lol but I am currently craving one and I will have one !