5 days lasts - Negative blood test

Hailey • Mother of 3 amazing children! 👦 03/04/10 👧 04/29/12 👶 01/07/16 ❤️️
After 3 days of no period I got a blood test, came back negative. Today is day 5 and no sign of AF, I am always regular and have not been particularly stressed the past few weeks. The only time I have ever missed my period is when I was pregnant. I am so confused, I don't know what to do!