I need help quite worried 😩

Kenny
Okay so I went out last weekend and I don't know if I got really drunk or drugged but I can't remember anything after 2am the last thing I remember was dancing in the club, then I remember a little bit later when I was sat outside around the corner of the club, and then it was all black until about 7am when I'm walking around some housing estate with no shoes, bag, money or phone some dog walker saw me crying and helped me out so I got home safe
But my issue is I started bleeding on the Monday which I think I was due on so that make sense but I've bled for 6 days now and it's not normal for me I usually bleed for up to 3 days. It's not a lot of blood 
Should I see a doctor or is it normal? I'm just thinking if it was to do with that night like if I had sex? I can't say I did because I really don't knowÂ