Sometimes the hymen doesn't completely break, so it can cause more bleeding the second time around. (Which is typically a cause of second bleeding). Sometimes you can start your period a little earlier because of sex. Sometimes rough sex can cause a little bit of bleeding. An allergy to latex or lubricants can also cause some bleeding (although it is usually accompanied with itching, pain, and swelling so I doubt this is your problem). I wouldn't worry too much unless the problem persists next time you get intimate. If you continuously bleed with sex, you may want to make an apt with a gyn- rarely an abnormality in a woman's body like a odd shaped uterus can cause painful sex and possibly bleeding. Like I said though, I wouldn't worry about it now, but if it keeps happening after intercourse each time then see a dr.
Thank you so much we did it today & everything was perfectly normal!!