Welcome to HCM.
It is quite common and normal thing to rupture hymen
& mild bleeding on first sexual intercourse or with entering penis first time. It is one of the sign of virginity loss.
Hymen may be ruptured in other causes like using tampon,horse riding,masturbation
,with sola pith, inserting any object etc.
It does not causes problem in future marriage if you do not sex several times with bf. As it may cause laxity of vagina sometimes. So after marriage,your husband may doubt about previous sexual relationship. So be aware of that.