20 days late... Going slightly insane...

Cierra

So I'm officially 20 days late with 4 negative urine tests. My periods are usually no more than a day late... I'm not under any stress, no weight gain/loss, no medications, etc. We've been TTC for about a year now... But also, other than feeling tired, slightly bloated, and occasionally nauseous (mostly at night) I haven't had any "pregnancy" symptoms. I'm seriously at a loss... Can anyone give me some insight??