Still late for af

According to glow I was suppose to start af the 16th. I had spotting that morning once when I peed and wiped and that was it. I did have af in april and may. April was 6th to the 9th same as may. Then again on 13th to 21st of may.Took a hpt yesterday and it was negative I don't know what's going on. pics was taken a few mins ago