I had a delay of 10 days. The test was negative. In a week already test was positive [I don't know how say it.. Anyway I was pregnant].Best do not torment yourself with guesses and go to the doctor.P.S. Sorry for my english

I'm assuming that you've had sex recently, but I wouldn't worry too much, please note I'm not an expert though.Ps. I'm late by 14 days, so I feel you on panicking- but I haven't had sex in like 5 months so I know it's just stress or something 

You might not have ovulated this month or just ovulated later than normal for some random reason. Meaning, your period could start at any time or pick back up next month where you usually get it. If you're not having any other pregnancy symptoms and have had TWO negative tests I'd feel pretty confidently not pregnant.