I am 20 years old, I had my period in July (13th) which seemed normal, however I had period again on 7th of August, a little early I thought, but that didnt worry me too much because I am aware that happens sometimes. What I dont understand is this morning (25th Aug) I 'apparently' bled, I was really confused because I didnt even get the usual 'symptoms' of getting a period. What does this mean?

P.S I am in a physical relationship but I am pretty sure we haven't done it in the past 2 months