helllpppp

Me and my husband have been trying for a baby for about my a year now. I have been experiencing slight cramping off and on for about a month AF was here the beginning of this month and is due October 5. After sex about a week ago I experienced super light bleeding but didn't last but maybe an hour and again the next day after sex again. Implantation bleeding? My appetite has increased to where I don't feel full but sometimes after eating my tummy gets really upset. I haven't gained weight but I feel like my stomach is fatter... Anyone else experience this?? Could it be early signs of pregnancy?