What Causes Slight Bleeding After Urination?

spots of blood down below. Ive had a penis go in to my vagina, he puts tissue on his penis. Is dis classd as sex and losing my virginity? Also fingering. Can i become pregnant? Also when i urinate and wipe my self i notise spots of blood 4 a few days after. Why is this and will it effect me in anyway? Thankyou