HELP! 5 days late, BFN

Hi guys!

Have all the symptoms (nauseated, tender breasts, major fatigue) and I'm 5 days late. I'm still getting a BFN. The only other time I've ever missed a period I was pregnant (wound up MC). That was 2 years ago. This was my first cycle tracking anything so I think I ovulated on the 31st or the 1st (BD on the 30th and 1st). Any ideas what's going on? I'm so confused. Should I call the doc and go on for a blood test or continue to wait? Help me, please?