first period after chimical pregnancy

Carolina

hi everyone I just wanted to know how long Does it take to AF to come back after an early mc I had a chemical p on July 19th and I'm supposed to start my period yesterday that it was on my cycle day 28 and I am regular sometimes 2 or 3 days max but every month I have my period so I'm a little bit concerned because now I just have a little bit of spotting and it's very there in these brownies like usually like how it looks like on the end of