false positive?

ughhhhh...sooooo my period is over and 3 days after I start cramping like if it was coming back which never happened before with me.13dpo I decided to take a ovulation test and it was so positive the test line had most of the color(my temps are still low) then for the f of it I take a pregnancy test an wth it was positive sooooo I take another one and alil fainter than the first one.Next day it's negative (urine was alot lighter to)but still super positive opk.What do y'all think???