Hi thanks for your question.
Most probably you have got a minor abrasion on your labia minor during sex.There is nothing to worry,it will get healed of itself.Application of bactitracin is the right treatment,continue that. Addation you may need sysytemic antibiotics.Vaginal discharge
may be due to yeast infection,for which you need consultation with a gynaecologist.
Hope this answers your question.