Pregnancy Test Results Confusion

Patient: Hi there I had my last period on 30th June.I have felt quite sick and had very tender breasts so I took 2 pregnancy tests on Monday (clearblue digital) they were both positive with 1-2 week conception indicator.At the Doctors on Tuesday the blue dye test was negative. Afterwards I bought 2 more of my own clearblue digital again and both negative. I don’t understand.It has now been 34 days since my last period.