Glad the advice helped. Peace of mind is a good thing.
Anyways, to follow up on what Glitter said, it could be spotting from the ECP, or it could be that you have a microtear in your vaginal wall either from the PIV sex or from the manual sex (fingernails, even closely cut ones, can sometimes scratch the really delicate tissue down there.) That's what might be bleeding, particularly if it keeps getting irritated.
In your position, I would hold off on any kind of penetrative sex (manual or PIV) until there's no bleeding and you feel comfortable. If this takes more than a week, I'd see if I can stop by that clinic again (see if they take a sliding scale) and see if they can check you out.
In terms of minimizing the risk for bleeding, I've found that using latex gloves for manual sex, and combining them with lubricant, helps keep my partners from accidentally nicking me with a fingernail or causing tears, because the latex covers their fingernails and any roubh patches of skin. Similarly, condoms and lube during penetrative sex help keep me from feeling "rugburned" during PIV sex. Those are just some things for you to consider as you keep making decisions about sex.