Can animals sense a pregnancy?!

I have been feeling off lately and I noticed my cat has been cuddling up to my stomach more and more. Hes normally a complete ass hole and never cuddles with me. I also had a dream last night that I had a baby girl (the last time I had a dream about someone being pregnant, i found out my step mother was expecting). Well I just realized today that my periods two days late. I took a test and got the absolute most faintest positive. I'm going to retest in a few days to be sure since it was so faint...I