Last pregnancy lasted forbloodyever. If my suspicion is correct and I ignore it for a bit then I can get an extra few weeks not "knowing".
I can just get on with my life and be tired because of work and a toddler and not because of work a toddler and a pregnancy, I can drink coffee without DP raising eyebrows and waiving decaf in my face, and I won't have DM calling to see how I'm feeling 20 times a day. Oh and I can put off worrying how I'm going to juggle a full time job and 2 kids under 3.