Weird stuff going on!

Okay so a long and odd one... so me and my partner have been having regular sex and recently I've started getting really sneezy! I'm not sick so it's odd. Also, my cat has stopped coming near me. he used to be my shadow but the past few days he's more for my partner! I've had a bit of ewcm today and been a bit crampy but I thought I'd already ovulated, my last period was 30th January. I did a pregnancy test last night and it was negative! :(