Cat sensing pregnancy before you do?

I know this sounds totally werid and trust me I'm not going by my cat as a pg test lol but since around my fertile week she started to becoming more loving towards me she's affectionate but this was different and became more as the two weeks went on she started just meowing at me and following me everywhere she woke me up at 4 am on my chest purring which she had never done (she's older as well not really old but not a kitten got her from a friend never really figured out exact age) anyways she started to sleep and lay on my lap every morning once I got off work or laying beside me on the couch like right now as I type this. I'm due for my AF either 13-14-15 of December they're never regular. And I usually test to early so I'm trying not to go out and by any don't have much symptoms of pg or AF either so I'm not saying I am but has anyone else had this happen or know of someone who's cat or pet I'm more so looking for cat behavior though sense their pg once they've concieved ? I've read stories online but wondering thoughts you ladies have about it or stories. Here are some pics from different days of her beside or on me lol