Is this implantion bleeding?

My period is due on the 20th of July I started light bleeding/spotting after intercourse it was extreme light though so I figured AF showed up early I wore a pad and then went to bed then I woke up and no bleeding usually my periods are heavy on the first day they start light and then get heavy well I spotted pink/brown and then it stopped so now I’m left with the question what is going on??? I already ovulated once this month so what’s happening? No signs of period at all rn