Its good you even think of the fl situation even though you are in trouble yourself. You have my admiration for that.
From a girl's POV, you can look for the fl and give her your number (prepaid number) in case she really get pregnant. But then again how can you ensure you are the cause of her pregnancy? A bit of grey area here. If you wanna help her then you have to give her the benefit of doubt. Or you can give her some money to purchase the pills.
Secondly, please refrain from sex till you are given all clear of Aids/stds, which may taken months.
Thirdly, invest in good quality condoms next time.
You may not help her much for her own situation, but if I will her, I be touched by your small gesture of concern.