Super random!! Cats & pregnancy

So I'm TTC #1 I have 2 kittens (almost 1 years old) recently they've both come into season at the same time (this NEVERhappens) one comes into season and the other comes after about 3 weeks they are never in season together. Anyway they've both been extra affectionate towards me this past week and I have read before that pets sense pregnancy. I'm wondering if these two know something I don't.. Any thoughts?