i don't think you can get pregnant so early after AF it has to be anything from 2 weeks since the first day AF starts. If you do not want to conceive use contraception and condoms to stop an unplanned/unwanted pregnany and STD's I don't think you have anything to worry about
chances are possible....It could be that when you had sex again and you bled it was implantation bleeding from the baby attaching to the uterus.Unfortunatly mother nature can always change things up on us and just act wacky on us one month....Wait and see if you have your next schudled period if you end up being late buy a test and take it...Best wishes and i hope everythign turns out in your favor.:)
It is unlikely but possible. What it sounds like to me is that the "plumbing" was a little backed up, and when you had sex, you "unclogged the pipes." That happens to me sometimes-where I think my period is gone, and then I have sex, and a little tiny bit of blood comes out.
If you have a very regular cycle, then you ovulate 14 days before your period is due (unless you have a luteal phase defect - uncommon). Not necessarily 14 days after your period starts though. If you have a 30 day cycle, then you ovulate on day 17 and get your period 14 days later. If you have a 20 day cycle, then you ovulate on day 7. So, without you providing the length of your regular cycles, it's very hard to say. If you were only on cycle day 6 or so when this bleeding happened, I HIGHLY doubt it was implantation bleeding. Implantation bleeding, at the VERY earliest, occurs around 6 days after ovulation and up to 12 days after. If it occured at 6 days after ovulation, then that would mean you ovulated the day your period started - which just doesn't happen.
With all that said, I think it is HIGHLY unlikely, but never impossible. Any time that you have unprotected sex, you can get pregnant. If you don't want a baby right now, please use birth control.
Good luck in whatever outcome you desire.