4days late

Samantha • Due with baby #1 in May!
So I'm 4days late and I have been exactly on time for the past 5-6months. Even when I've been late before that it's never been 4days. I've taken equate and clearblue digital both of which came up negative. I don't really notice any symptoms except maybe that my nipples are so sensitive and not in a good way. Has this happened to anyone?