Cat acting diferent can she know before me??

My cat she is 3 yrs and usually likes to cuddle a lilttle then leave her way!
​But for the past 1 1/2 she wants to be with me all the time, cuddles and if I'm on the couch she comes and lays with me if I go to bed she follows me and sleeps by my side all night can she know anything before me?? My period won't come till the 3rd some one help ??