Okay need help!!

My period is never late, and I’m 4 days late now, took a test and still negative!!! Been trying for a baby so I am getting upset. It’s been 11 or 15 days since ovulation and I think it would show up by now right? If I don’t start my period by next week I will take another one, but I just feel like I am gonna get disappointed!! 😭😭😭