Help!!!

So my period is Officially one day late. My period is always punctual. I have been trying to concieve baby #2 but I took a pregnancy test Wednesday night but it was negative I took one today and it was also negative. I'm completely confuse! I kind of feel like I'm gonna get my period but it's not showing up. Idk what's going on. This has never  happen my period is a 28 day cycle and it's always on time! Any advice of what I should do?