Positive test and then a negative?

Amanda

I'm so confused! I'm supposed to be 6 weeks today (and very nervous since we had two miscarriages earlier this year). I took two pregnancy tests last week. One digital and one standard. Both came up positive! The standard one was faint but there was definitely a + line. Because I'm nervous I took two other standard tests today and they were absolutely negative! I don't have another digital but may consider getting one until I can call my doctor again tomorrow. My first ultrasound isn't scheduled until 9/19. Has this ever happened to anyone!?!? I'm so nervous.