Is this a period again?

NS

I had a d&c done on July 25th, then had what I think was a period on August 19th; started with brown spotting/light bleeding for 3 days, then regular period blood for 7 days. I started spotting again today, bright red blood, it’s CD 16 today .. I think🤷🏻‍♀️

I have also noticed that both times I started bleeding the day after I had sex, so I’m not sure what’s happening?