Pets being able to sense pregnancy

Do you think pets can sense a pregnancy? My SO thinks I'm pregnant because our cat has been following me everywhere for the last couple days. If I lay down he will come lay on my stomach and no matter if I push him off he comes right back. If I get up he follows my every move. He is usually not like this he would usually keep to himself and would only want affection on his terms lol. Ohh and today is the day my period is supposed to come but nothing yet. Don't feel Crampy or anything. Took a test on the 23rd and it was a BFN.