Ok
Definitely not implantation bleeding 24-48 hours after intercourse. Implantation bleeding is actually very rare with only 20% of women experiencing it so it's not exactly something you should expect to happen with conception. I'm 11 weeks and didn't have any spotting at all. Sounds like you had intercourse a bit too rough and might've irritated your cervix causing you to spot.
I’m not sure what’s going on but but its not implantation bleeding sorry the earliest you can implant is 6dpo