Is it a fluke?

Crystal
Ok so I had a positive test a few days ago. I've never had a positive and it not result in a baby. However I have had a lot of negative test for weeks before the positive result.  Since the positive test a few days ago I have missed my period but I took a test today not in the am and it was BFN ! I am nauseous, I have headaches every day for about a week.   The runs and tired... This would be my fourth I FEEL pregnant! DR appointment isn't until 4/19 so ladies do you think I'm ok or what???