Confused

So I took two tests (from Walmart) on Saturday one had a darker line and one was a little lighter but both faint. I went to velocity care and they said gave me 3 tests as well they can only read it 3 - 5 mins after the test is administered. But after the 6th minute it changed positive with a faint line. The doctor told me to wait to days and take another one that my HGC levels are just really low. My husband got a test (from Kroger) last night for me to take this morning. I took it this morning and it says negative?! I’ve taking 5 tests that were positive with a faint lines and one negative. I left a message with the OBGYN but nothing yet. Too picture is one of the positive tests and bottom is the negative.