Blood after having a -no intercourse- sex

[mousaeed90]

I was with my GF 3 days ago and we had some anal play. We also had direct contact between my penis and her vagina but from the outside.

2 days later we found a blood spot in her panties. What could be the reason behind this bleeding? noting that it only toke place 2 days after we were together.

Am quiet sure i did not mess with her virginity because we did not go any deep.

Your assistance is really appreciated.

Thanks a lot