Will someone tell me what they make of this?

(4 days leading up to Sunday the test started very light and got a little darker each day)
Sunday - Almost positive OPK
Monday - POSITIVE OPK (BD this day)
Tuesday - OPK test line a little lighter than yesterday
Wednesday - OPK yet a little lighter
Thursday - OPK was lighter
Friday - OPK was POSITIVE again (??????????)

**I have been taking them at the same time everyday and tried to keep my urinary conditions the same.

*Was Monday the right day to try??

:dizzy: