Missing peak

I first tested Friday and got a flashing smiley I then forgot to test sat and Sunday (is it possible

i got my peak on those days and missed it) i tested again yesterday and today and got flashing smiley. If I missed my peak would the reader still show a flashing when I tested or would it show low ? I just don’t know if I should keep testing I’m on cycle day 21 now. My flo app predicted my ovulation on Saturday