2 days in a row?

Yesterday's test is on bottom today's is on top (7 min ago) I'm on CD36 I've never had a cycle over 25 days.... First month off of skyla.. I took a pregnancy test 3 days ago and got a BFN but this is the 4th time in 36 days I've shown a positive ovulation but first time for two days in a row... Any clue what's going on?? Thanks in advance for ur opinions